Durst AC 800 AF by Dmdv Chjhl

AC 800/AF Userâ&#x20AC;&#x2122;s Manual

Instructions for safe use of the Durst AC 800/AF

There are no hazards, specifically electrical hazards, under proper conditions of use. Extra precautions for the safe use of the equipment are given below. a) The enlarger Durst AC 800/AF is fitted with an earth wire for protection against electrical shock, which also ensures electro-magnetic safety (EMS/interference suppression). This earth wire can however only fulfil its function if your mains connection (socket) is also earthed. Have your mains connection checked by a qualified electrician for an earth connection. b) Extra protection is offered by a ground fall interruptor, which an electrician can install in your lab. c) Avoid continuous high relative humidity and condensation. Protect the equipment from splashes of water and chemicals. d) To ensure proper functioning, maintain the following operating conditions: relative humidity: 5 - 95 % r. h. ambient temperature: 15 - 30 째C. e) Do not make any repairs to the electrical system of the equipment by yourself. Have them carried out by a service engineer. f) Before opening the power unit, lamp house or disconnecting cables, make sure that the unit is switched off and that the mains cable is unpluged. g) Danger of injury on AF version. Persons must keep clear of moving parts during motorized adjustment, due to the danger of injury. h) Before changing the lamp, switch off the equipment, let it cool down and pull out the mains plug. There is a risk of injury by burning when changing lamps. i) The manufacturer does not accept liability for any damage caused by neglect of the safety precautions.

Durst AC 800/AF-03/96

Congratulations on your purchase of this Durst equipment. It is the result of intensive research and development by Durst Phototechnik AG, Brixen, Italy. The Durst company has been attested by the German Society for the Certification of Quality Assurance Systems for conformity of its products to Standard ISO 9001/EN 29001, Certificate No. 44 411 - 01 dated 30.04.93, which guarantees the highest quality in development and manufacture. Durst equipment is carefully inspected and tested before delivery. The technology and specification represent state-of-theart optics and electronics. New developments and enhancements are continuously incorporated; the diagrams, dimensions or technical data shown in this manual may therefore have been modified to take account of the latest advances. This manual describes the optimum operation of the machine, and contains basic instructions on handling, potential faults and operating mistakes; it is advisable to read it carefully before putting the instructions into practice. If you have any queries or require extra information, please contact your local Durst Service agent. Please help us to improve this manual, and send us your comments on the two pages at the end of the manual. Durst Phototechnik AG Brixen, Italy

Durst AC 800/AF-03/96

Page

Index

1.2 1.3

Introduction and brief description Description of the Durst AC 800 and AC 800 AF enlargers Technical data Items included

2.0

Assembly and installation of enlarger

3.0 3.1 3.2 3.3 3.4

Specific enlarger functions Autofocus Subtractive exposure control with pre-filtration Basic calibration by reflection densitometer Automatic colour filtration by integral reading method Automatic colour and density under-corrections „FXFF“ function: fixed exposure time and filtration „VXFF“ function: automatic density control and fixed filtration

14 14 14 15

4.0 4.1 4.2 4.3

Description of functions of operating elements The colour head The transformer housing The remote control (accessory)

17 17 18 18

5.0

The memory system of the Durst AC 800/ AC 800 AF „CAL“ basic memory „XCP“ paper slope Slope for under-exposed „LN“ (Light Negative) negatives or over-exposed slides Slope for over-exposed „DN“ (Dark Negative) negatives or under-exposed slides Colour and density under-corrections

1.0 1.1

3.5 3.6 3.7

5.1 5.2 5.3 5.4 5.5 6.0 6.1 6.2 6.3 6.4 6.4.1 6.4.2 6.4.3 6.4.4 6.4.5 6.5 6.5.1 6.5.2 6.5.3 6.5.4 6.5.5 6.5.6 6.5.7 6.5.8 6.5.9

Calibrating the Durst AC 800/AC 800 AF Preview Table of factory calibrations for the supplied test negatives Switching on the enlarger/preparations Autofocus and focus variator (only for Durst AC 800 AF) Preparations Steps for setting the autofocus Subsequent correction Manual focusing Setting the focus variator to a raised/lowered projection level Calibrating a memory channel for colour negatives/slides Making preparations Setting pre-filter arrangement Activating the basic calibration Adapting the exposure time for individual filters with pre-filters Continuing and finishing basic calibration Calibrating for maximum „XCP“ enlargement (compensation of reciprocity effect) Calibrating for under-exposed „LN“ negatives/ over-exposed slides Calibrating for over-exposed „DN“ negatives/ under-exposed slides Automatically ending the calibration mode

6 7 8

15 16 16 16

19 19 19 20 20 20 22 22 23 24 25 25 26 29 31 31 32 32 32 33 33 34 35 36 38 39

Durst AC 800/AF-03/96

Page

6.6 6.6.1 6.6.2 6.6.3 6.6.4 6.6.5 6.6.6 6.6.7 6.7 6.7.1 6.7.2 6.8 6.8.1 6.8.2 7.0 7.1 7.2 7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 7.2.7 7.3 7.4 7.5 8.0 9.0

Calibrating a memory channel for black/white enlargements Preparations Setting pre-filters Basic „CAL“ calibration Calibrating for maximum enlargement (compensation of „XCP“ reciprocity effect) Calibrating for under-exposed „LN“ (Light Negative) negatives/over-exposed slides Calibrating for over-exposed „DN“ (Dark Negative) negatives/under-exposed slides Retrieving and noting the stored figures Pre-production test Pre-production test for colour negatives/slides Pre-production test for BW negatives Adapting memory to production Correcting colour negatives/slides Correcting BW negatives Practical work Preview Steps Switching on Making preparations Setting the focus variator Setting the enlargement Manual colour and density corrections Printing a different film or paper type Ending Using the „Automatic density control and fixed filtration“ function („VXFF“ key) Using the „Fixed exposure time and filtration“ function („FXFF“ key): producing contact prints Distortion control

42 43 43 44 46 46 46 47 47 48 49 49 50 50 50 51 52 53 53 53 54 55 56

Troubleshooting table and explanations of error warnings

Maintenance and care

10.0 Special accessories

Durst AC 800/AF-03/96

39 39 40 40

Introduction and brief description

1.0

1.1 Description of the Durst AC 800 and AC 800 AF enlargers

The Durst AC 800 is a universal microcomputer-controlled colour enlarger with built-in reflection densitometer for the automatic calibration of memory channels for colour and black-and-white negatives as well as transparencies for all sizes up to 6 x 9 cm (2 1/4 x 3 1/4 in.). The Durst AC 800 controls the exposure by integrated readings below the negative stage during the exposure itself. All further operational characteristics are described in section 3.0 of this operating manual. The Durst AC 800 AF enlarger also incorporates autofocus. AC 800 1. Colour head with integrated reflection densitometer. 2. Film-format-related interchangeable mixing box 3. Mechanical focus knob 4. Height adjustment with coarse and fine setting 5. Column with distance and enlargement factors 6. Power unit 7. Baseboard

1 3

2 5 6

AC 800 AF 1. Colour head with integrated reflection densitometer. 2. Film-format-related interchangeable mixing box 3. Autofocus 4. Height adjustment with coarse and fine setting 5. Column with distance and enlargement factors 6. Power unit 7. Baseboard

1 3

2 5 6

1.0 Introduction

Durst AC 800/AF-03/96

1.2 Technical data

Durst AC 800/AF-03/96

Column height:

111 cm

Total height:

113 cm

Baseboard size:

65 x 65 cm

Usable baseboard area:

60 x 56 cm

Optical axis/column distance:

29 cm

Light tracking:

Via fade-proof interchangeable mirror shafts (35 mm, 6 x 6 cm, 6 x 9 cm)

Exposure control:

Via microprocessors

Light monitoring:

Mixing shaft measurement for automatic compensation of colour temperature shifts in case of voltage fluctuations and lamp deterioration or lamp replacement

Calibration system:

Via built-in reflection densitometer and user’s guide

Operating modes:

Colour negatives, colour transparencies and blackand-white negatives

Cooling:

cooling fan

Filters:

dichroic filters (Y, M, C)

Max. filter density:

130 densitometric units (= D 1.3)

Manual correction range:

+/- 99 densitometric units (Y - M - C - D)

Lens focal lengths:

50, 80, 100/105 mm

Focusing:

Manual (AC 800) Autofocus for 3 focal lengths (AC 800 AF)

Print sizes:

up to 40 x 50 cm (16 x 20 in.)

Connection plugs for:

Roll paper easel or footswitch, AC 800 Control remote control, supplementary socket with supply voltage

Mains supply:

• for 100, 110, 120, 220, 240 volts to be set with voltage selector switch • 50 - 60 Hz

Power consumption:

approx. 350 watts

Netweight:

40 kg

1.0 Introduction

Enlargement factor Lens focal length 100/105 mm 80 mm 50 mm

Film size

min.*

max.*

6 x 9 cm 6 x 6 cm 24 x 36 cm

1.5 x lin. 1.1 x lin. 4.3 x lin.

7.3 x lin. 10.3 x lin. 17.8 x lin.

*Guide values

1.3 Items included

Durst AC 800 consisting of: 1 basic unit both with built-in automatic subtractive exposure control and built-in reflection densitometer with baseboard, column and colour head. 1 Cobineg film carrier with a top Bimagla AN glass. 6 x 7 Binema 67 metal mask pair for print sizes up to 6 x 7 cm. 1 set AC test negatives with reference print. 1 Colamp 250 S halogen lamp (250 W/12 V). 1 AC 800 mixing box - Box 69. 1 connecting or mains cable. 1 operating manual. Without lenses and lens circuit board. Durst AC 800 AF As above, but with micro-processor controlled focusing for 50, 80 and 100/105 mm lenses. 1 test lens 69 for the focus calibration.

1.0 Introduction

Durst AC 800/AF-03/96

Assembly and installation of enlarger

Space requirement The Durst AC 800 is designed to take up minimum operating space (100 x 100 cm or 40 x 40 in.) so that it can be located on a bench in any darkroom or mounted on the wall for use with roll paper easels.

2.0

Assembling the basic enlarger Place the column (1) and column base with transformer housing (2) and enlarger head (3) so that the transformer housing protrudes beyond the table edge. Hold the baseboard (3) against the transformer housing and - using the wrench (6) supplied - screw the five hexagonal bolts from underneath through the baseboard into the column base, ensuring that the reinforcing plate (5) is first fitted beneath the baseboard.

1 6 4

Fitting the tungsten-halogen lamp (COLAMP 250 S) To fit the 250 watt/24 volt tungsten-halogen lamp (1) press the locking button (3) and remove the lamphouse cover (2). A retaining ledge and springs are visible inside. Mount the tungsten-halogen lamp (1) on the lamp fitting and push it underneath the retaining springs. Take care never to touch the inside of the reflector with the fingers.

2 1

Durst AC 800/AF-03/96

Fitting the lenses â&#x20AC;˘ Fully screw the lens into the appropriate lens board (1). â&#x20AC;˘ Insert the board together with the lens into the lens stage (2) so that the aperture scale is visible from the front. â&#x20AC;˘ Secure the lens board with milled screw (3). Lenses and the lens boards or tubes needed for them are available separately (see section 10.0).

2.0 Assembly and installation

Fitting the red filter for black-and-white enlarging To mount the red filter (1) screw the red filter shaft into the appropriate borehole on the lens stage and secure with locking screw (2).

Fitting the mixing boxes Push the mixing box required with the two retaining studs (1) into the cutout in the catches (2) underneath the colour mixing head. The catches must therefore be in their forward position - pull them forward if necessary. Once the mixing box is in position, push the catches back. The enlarger is supplied complete with the AC 800 Box 69 mixing box (3) for film sizes up to 6 x 9 cm. For increased light output when printing smaller film sizes, additional mixing boxes are available separately (see section 10).

2 1 3

Fitting the negative carrier Push the Cobineg negative carrier (1) fully into the enlarger head. To remove the carrier, slightly raise it first.

The negative carrier (1) is supplied complete with an upper anti-Newton glass (2) held in place by retaining springs (3). For glassless use the unit is supplied complete with a Binema 67 pair of metal format masks for the 6 x 7 cm film size. Additional pairs of metal format masks are available separately (see section 10). Raising the opening bar (4) locks the negative carrier open for insertion or adjustment of film strips.

3 3 1

2.0 Assembly and installation

Durst AC 800/AF-03/96

Adjusting the magnification Adjust the required print size by raising or lowering the enlarger head with the grips (1 and 2). For quick vertical adjustment disengage the mechanism by turning the inner milled grip (1). This way the enlarger head can be smoothly and quickly raised or lowered to the required position. Lock the head by turning the inner grip; fine adjustment is then possible with the outer grip (2). 2

Focusing (manually only with the Durst AC 800) Focus by turning the focusing knob (1) on the enlarger head. For focusing the lens diaphragm should be fully open; swing the filters out of the light path by pressing the „W. Light“ key. With the Durst AC 800 AF focusing is automatic once the autofocus has been programmed. 1

Description and mounting instruction of the AC 800 Wallmount AC 800 Wallmount is to be used with Durst AC 800 and AC 800 AF. It can be used: • when working with a roll paper easel • when doing high magnification (e. g. floor projection) Mounting the wallmount • Make sure that the wall does not show any uneveness. • Mark the position of the fixing screws on the wall. Note Distance between roll easel and holding plate (1) = approx. 12 cm (4 3/4 in.) 29 cm (11.4 in.) 48 cm (18.9 in.)

Durst AC 800/AF-03/96

12 cm (4.7 in.)

2.0 Assembly and installation

• Drill ø 10 mm holes for top fixture (5) and bottom holder (2) as described beside. • Fit top fixture (5) to the wall. • Screw the plate (4) to the bottom of the enlarger column. • Fasten parts (1) and (2) with screws (3) and fit it to the wall. • Lift the enlarger column on the bottom holder (2) and screw on at top and bottom with screws. • Set the enlarger vertical and horizontal with a spirit level and tighten the screws.

8 cm 3.1 in.)

4 5

1108 cm (436 in.)

12 cm (4.7 in.)

3 1 6,9 cm (2.7 in.)

Colorhead

AC 800

AC 800 Control

Remote Control

Connection for roll paper magazine The adjacent drawing shows the schematic layout for enlarging with a roll paper magazine. The cable connections as shown in this drawing are made for the power supply. Roll paper easel

Rollbox

Mains cable Mains cable

2.0 Assembly and installation

Durst AC 800/AF-03/96

Socket „Roll paper easel“ Exposure end

The Pin arrangement for installing a roll paper magazine on the AC 800/AC 800 AF is shown beside.

2a 2b

Transport start

Ready

Focus

Start

Power unit EPU 1200 (AC 900N, 901, 1200N, 1201) AC 800, PCM 1000N, PCM 1001

Roll paper easel

Socket „Roll paper easel“ Exposure end

Focus

Start

Ready

Power unit EPU 1200

Durst AC 800/AF-03/96

Transport start

Schottky 1

3/4

User connector

Roll paper easel Effemme

2.0 Assembly and installation

Specific enlarger functions

3.0

3.1 Autofocus (only with Durst AC 800 AF)

The autofocus, which is set as the first step before calibrating the paper/film channel, permits exact focusing by a motor mounted on the side of the enlarger head.

3.2 Subtractive exposure control with pre-filtration

The exposure system on the Durst AC 800 requires only one filter set, in spite of the pre-filtration. To make this clear, the schematic process of an exposure is explained first without pre-filtration.

Phase 1

BGR

Phase 3

BGR

Paper

Phase 4

BGR

Paper

Phase 2

BGR

Paper

Phase 5

BGR

Before the exposure (phase 1), all three filters (yellow, magenta, cyan) are slotted in, which reflects the entire white-light spectrum (consisting of blue, green and red light). The slotted-in filters therefore function as a shutter. In phase 2 at the start of the exposure (without pre-filtration), all the filters are completely outside the beam. Phase 2 is called the white-light phase. In the first milliseconds of phase 2 the negative is analysed by the reading cells mounted underneath the negative. In the following phases the three Y, M and C filters are exposed, depending on the strength of the colour correction. Now the Y, M and C filters are successively and completely slotted in in phases 3, 4 and 5 (see drawing). The length of the single phases is a measure of the relevant colour intensity. For instance if the yellow filter is slotted into the beam for a long time, a relatively large amount of blue is blocked, which results in less yellow coloration of the photo-paper. So in this case the filter exposure times in the white light regulate the colour composition of the exposure light. At the end of phase 5 all the filters are back in the beam, and so serve as a shutter.

Paper

3.0 Specific enlarger functions

Durst AC 800/AF-03/96

Phase 2

BGR

Y M C

Paper

The pre-filtration Since colour paper is not equally sensitive in all three layers, the exposure times for blue, green and red vary widely. For example colour paper is relatively insensitive to red light, so the red exposure phase (phase 5) is longest. The length of the total exposure phase is therefore determined by the longest exposure phase of one colour. Shortening the exposure time by opening the aperture is usually not possible, since otherwise the short exposure time of the layer sensitive for the colour paper (e.g. blue) cannot be kept to exactly. Pre-filtering the white light can make the three exposure times equal, so that the total exposure time is shortened, for instance by opening the aperture. During pre-filtration two of three filters are slotted into the beam in phase 2, as needed (the three filter slot-in times should be equal, see drawing). The position of the filters can be set at the top right of the colour head, as shown in the right-hand diagram in the adjacent drawing. Full instructions are given in Section 6.5.2.

3.3 Basic calibration by reflection densitometer

The projection light serves as light source for the reflection densitometer integrated in the enlarger. It is diverted via a cell in the diversion channel. During basic calibration the test grey field is compared with the reference grey field, and any variations are compensated via a microcomputer by controlling the filters. Full details are given in Section 5.1.

3.4 Automatic colour filtration by integral reading method

The AC 800 relies on the integrated reading method comparing all negatives or transparencies against the calibration negative or transparency during the metering sequence. The unit considers the film original as a homogenously coloured image and matches colour as well density to the calibration (standard) negative or transparency. The automatic colour and density corrections can of course be manually changed. Refer to Section 7.2.5 for this.

Durst AC 800/AF-03/96

3.0 Specific enlarger functions

3.5 Automatic colour and density under-corrections

One of the major advantages offered by the AC 800 is the automatic compensation of predominant negative or transparency colours. Thanks to this system it is possible to obtain a higher share of balanced prints, made at the first try, from negatives or transparencies having predominant colours, as opposed to conventional metering methods. For example: You might have a portrait of a girl in a brilliant red dress. With the integrated reading method this would yield a print with a blue-green cast. Low correction will automatically compensate this predominant colour of the film original, without affecting the colour balance of normal originals. Full explanations and instructions on setting the low correction are given in Section 5.5.

3.6 „FXFF“ function: fixed exposure time and filtration

Pressing the „FXFF“ key disengages the automatic colour and density measurement (the red LED lights up). Negatives or transparencies are then printed with constant exposure time at the fixed filtration of the last negative or transparency to be measured. This mode still compensates for different magnifications. If a negative has to be moved in the carrier you can first make a blind exposure with the negative centered and then switch to „FXFF“. FXFF is also used to produce contact prints (see section 7.4).

3.7 „VXFF“ function: automatic density control and fixed filtration

Pressing the „VXFF“ key provides automatic density compensation with fixed filtration, based on the filter values of the last measured negative or transparency. All film originals exposed under identical conditions (same lighting, film emulsion etc.), for example studio shots, wedding pictures, snow pictures, seascapes etc. can be printed in the fixed filtration mode with automatic density correction, without being affected by uneven colour distribution in the original.

3.0 Specific enlarger functions

Durst AC 800/AF-03/96

Description of functions of operating elements

4.0

4.1 The colour head

„Bal. adjust“ key: • To trigger the reflection densitometer’s metering cycle for reading the film original. • To record, in conjunction with the „Enter“ key, grey reference values (AIM values for YMC). 2. „Enter“ key: • Electronic locking device for the single calibration modes (CAL-XCPLN-DN) and their memory values. 3. „Set-up“ key: • To trigger a calibration sequence or for jumping over the memory values of the memory channel being indicated. •To record, in conjunction with the „Enter“ key, the calibration values ascertained. • To reed, in conjunction with the „Enter“ key, correction values into the memory during the normal production.

Durst AC 800/AF-03/96

12 13

4. „Hold“ key: • To retain colour and density correction values for further exposures in the normal printing mode, i. e. these values won’t be automatically erased after the exposure. 5. „FXFF/VXFF“ key: „FXFF“ = Colour and density values of the previous exposure are recorded automatically and used for the following exposure. „VXFF“ = The filter balance of the previous exposure is recorded automatically and used for the following exposures - only density changes of the film original are compensated. Note: In the FXFF and VXFF modes, the enlarging paper’s reciprocity failure will be compensated automatically after magnification changes.

6. „F.Var./ill“ key: • To enter the distance if the projection plane’s position changes (e.g. wall mounting or reductions). Enlarging easel range: -99/+999. • To switch the LED displays on or off. 7. „Channel Mode sel.“ key: • To call up the required memory channel. • To select, in conjunction with the „Enter“ key, the desired mode of operation (Neg-Pos-B/W). 8. „Disp. Select“ key: • To call up the following indications on the display: Basic Y-M-C filtration values (only with plastic slide open); Y-M-C exposure times (only with enlarger lamp switched on); Y-M-C-D memory values (in the calibration mode); Y-M-C-D correction values (in printing mode); lens focal lengths only „Cal.“; lens aperture. 9. „+/-“ keys: • To change the values indicated on the display. 10. Operating mode display (Neg = colour negatives, Pos = colour transparencies, B/W = black-and-white negatives). 11. Display indicating the channel selected (0 - 9). 12. Calibration mode display (Cal = basic calibration, XCP = paper slope, LN = slope for light film originals, DN = slope for dark film originals). 13. Alternating display for: Head (H), Metering cycle (P), Focus Variator (d), Calibration (C), Lens (L), F/Stop (F), Exposure time (E), Magnification Factor (M-F) 14. Memory values display for: Yellow (Y), Magenta (M), Cyan (C), Density (D). 15. Memory value display of the calibration modes in use or correction value display in normal printing mode, display of lens focal length, lens aperture and number of exposures made.

4.0 Description of function of

operating elements

4.2 The transformer housing

1. „Expose“ key: To trigger or cancel an exposure. 2. „Light“ key: To switch enlarger lamp on or off or to interrupt an exposure. 3. „W. Light“ key: To swing the basic filtration out of the colour head’s light path. 4. „Power“ switch: On/off main switch.

3 4

4.3 The remote control (accessory)

1 Coloured selector keys to call up colour and density correction keys (YMCD) 2 Numerical row of keys (0 - 9) to enter required correction values as well as the lens aperture value being used 3 „-“ key to change the sign of the value being displayed 4 „Clear“ key to cancel an input 5 „Hold“key to keep correction value settings for following exposures 6 „W. Light“ key to swing basic filtra-tion out of the colour head’s light path 7 „Light“ key to switch the enlarger lamp on or off 8 „F/Stop“ key to run off or enter the lens aperture value 9 „Expose“ key to trigger an exposure 10 Variation of the light strength of the darkroom safelight mounted above the keys

4.0 Description of function of

operating elements

Durst AC 800/AF-03/96

The memory system of the Durst AC 800/AC 800 AF

The Durst AC 800 features 10 (0 - 9) memory channels per operating mode (30 in total), which can be allocated to different film and enlarging paper types or different shooting conditions. To select the desired memory channel, press the „Channel“ key (only possible while in the normal printing mode) until the desired memory channel number is indicated on the display.

5.0

This memory records the unit’s basic settings as far as colour and density are concerned. These settings depend upon enlarging paper emulsion, film type and processing. Pressing the „Setup“ key actuates the entire calibration mode. Lens focal length and lens aperture are selected by pressing the +/- keys and fed into the memory by pressing the „Enter“ key. By pressing the „Disp. Select“ key you may then call up the single memories for Y-M-C-D. The values stored in these memories can be modified by pressing the +/- keys.

5.1 „CAL“ basic memory

Note The Y-M-C-D memory values of the Cal, XCP, LN, DN operating modes are expressed in densitometric units (30 units = one lens aperture value).

5.2 „XCP“ paper slope

Paper = Cal, X.Comp Log E t

1,4 Cal

1,2

a E x t = constant

1,0 0,8

100

X. Ref.

This memory serves for the automatic compensation of colour and density shifts that may occur when printing overexposed negatives or underexposed transparencies. Depending upon the film material being printed, the yellow, magenta, cyan and density memory values can be modified during the programming sequence. Press the „Setup“ key to call up the „DN“ calibration mode and press the „Enter“ key to store the lens aperture value being displayed. Press the „Disp. Select“ key to call up the single YM-C-D memories and press the +/- keys to appropriately modify the memory values. In the chart shown the product of the radiation strength x time is plotted double logarithmically against the radiation strength. The reciprocity curve occurring with very short and very long exposure times deviates from the ideal constant Et (dashed line). The deviation is measured, interpolated linearly and automatically compensated. The instructions for producing „XCP“ are given in Section 6.5.6 for colour negatives/slides, and in Section 6.6.4 for BW enlargements.

log E

Light output on the baseboard a = Reciprocity curve of paper b = Interpolation c = Compensation

Durst AC 800/AF-03/96

5.0 The memory system

5.3 Slope for under-exposed „LN“ (Light Negative) negatives or over-exposed slides

This memory serves for the automatic compensation of colour and density shifts that may occur when printing underexposed negatives or overexposed transparencies. Depending upon the film material being printed, the yellow, magenta, cyan and density memory values can be modified during the programming sequence. Press the „Setup“ key to call up the „LN“ calibration mode and press the „Enter“ key to store the lens aperture values being displayed. Press the „Disp. Select“ key to call up the single Y-M-C-D memories and press the +/- keys to appropriately modify the memory values. The instructions for setting „LN“ are given in Section 6.5.7 for colour negatives/slides, and in Section 6.6.5 for BW enlargements.

5.4 Slope for over-exposed „DN“ (Dark Negative) negatives or under-exposed slides

5.5 Colour and density under-corrections

The colour and density under-correction takes priority over the calibration settings in all the memory channels (consisting of „CAL“, „XCP“, „LN“ and „DN“). Colour under-correction enhances the integrally read colour value (reading cells underneath the film carrier) for negatives and slides with dominant colours. The correction is made by a settable percentage which represents a limit for the integrally read colour value. The Durst AC 800/AC 800 AF incorporates over 17 under-correction steps (0 16), with step 0 allowing full (100 %) under-correction. Step 16 makes no under-correction, so that the subordinate colour setting applies due to the integral reading method used. Each step therefore represents a percentage of approx. 6.25% (100:16). The following practical example will help you to understand colour-under-correction. The exposure times (in seconds) for the three colour filters amount for example as calibrated by the test negative Y=4 M=4 C=4 With a photo with a dominant colour (e.g. a red car on a grey car park), the colour correction is falsified by the integral reading system. Y=4 M=4 C=8 If the colour under-correction is now set to the figure of 8 (percentage 50 %), this decreases the cyan filter time by 2 seconds, that is Y=4 M=4 C=6 since 8 - 4 = 4 (integral reading system correction) 4 x 50 % = 2 In addition to colour under-correction a density undercorrection can be made in the same way (16 steps each of approx. 6.25 %).

5.0 The memory system

Durst AC 800/AF-03/96

Factory pre-setting The factory pre-setting for colour under-correction incorporates an adaptation of the integrally read filter figures to approx. 50 %, no correction is made in density. Neg. Pos. BW

Y 6 4 -

M 7 4 -

C 8 4 -

D 16 8 8

Setting the colour and density under-correction The factory pre-setting can be adapted to special needs as follows. • With the enlarger switched off, hold down „Mode Select“ key and switch the enlarger on. • Holding down the „Enter“ key and pressing the „Disp. Select“ key displays one after another the Neg./BW/Pos. modes with the relevant parameters Y, M, C, D. • These parameters can now be allocated to the previously mentioned correction steps 0 - 16 with the +/- keys. Note As already mentioned, these corrections affect all the memory channels.

Durst AC 800/AF-03/96

5.0 The memory system

Calibrating the Durst AC 800/AC 800 AF

6.0

6.1 Preview

Switching on the enlarger/preparations Focusing/setting the autofocus/focus variator Calibrating the memory channels Pre-production test Adapting channels (optimising) for production: corrections in „CAL“/„XCP“/„LN“/„DN“ or „LC“ Correcting the focus

See Section 6.3 See Section 6.4 See Section 6.5 for colour negative/slides See Section 6.6 for BW See Section 6.7 See Section 6.8

See Section 6.4.3

Production

6.0 Calibrating

Durst AC 800/AF-03/96

6.2 Table of factory calibrations for the supplied test negatives

Channel no.

Film type

Aperture

Cal

XCP

Kodak Gold II 100

Y - 13 M-4 C - 11 D 39

7 3 6 6

1 0 1 -9

9 8 -1 -6

Fujicolor Super HR II 100

Y - 23 M-8 C - 13 D 47

0 -2 7 2

1 -7 7 -7

3 6 -3 -5

Konica Super SR 100

Y - 12 M-5 C - 17 D 49

0 -2 4 2

1 0 12 -8

1 0 -3 -2

Kodak 5026 VPS

Y - 12 M-3 C - 16 D 41

-5 -6 -3 9

1 2 3 -7

-1 3 1 6

Agfacolor XRC 100

Y 1 M 1 C - 11 D 41

-3 -7 -4 7

2 4 4 - 14

-8 -9 - 12 6

Fujicolor Reala CS 120

Y 26 M 33 C 11 D 87

1 -1 1 -1

0 -3 1 -8

11 13 6 -6

Kodak Vericolor 160

Y 26 M 33 C 11 D 88

1 -1 1 -1

-1 -2 -3 22

3 6 4 -6

Pre-filtration: Y = 81 M = 62 C = 6 Filter times at F = 8: Y = 4.7 s M = 4.4 s C = 4.6 s

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6.0 Calibrating

6.3 Switching on the enlarger/preparations a)

Fit the required mixing box and the appropriate format mask

• Insert the required mxing box. • Insert the format mask matching your film size as well as the AN-glass. Note: When printing transparencies, use the special Bidia insert. Bidia does not require the use of an AN-glass.

Switch the unit on with the main switch on the transformer housing

Film size 6 x 9 cm 6 x 7 cm

Mixing box AC 800Box 69

Format mask Binema 69 Binema 67 Bimagla AN

Lens 100/105 mm

6 x 6 cm 4.5 x 6 cm

AC 800BOX 66

Binema 66/ Binema 45 Bimagla AN

80 mm

35 mm

AC 800Box 35

Binema 35 Bimagla AN

50 mm

„p“ will be indicated on the display. • A blue-green-red metering cycle will be taking place. The resulting values are automatically stored by the reflection densitometer and will be used as reference grey for further measurements. • At the end of the metering cycle the enlarger lamp is switched of automatically the unit is ready for operation. On the display will now be shown the operating mode (Neg-Pos-B/W), the channel being used and the lens aperture value. Note If on the display the lens aperture indication were to blink, enter a smaller or larger lens aperture value. For this switch the enlarger lamp on by pressing the „Light“ key and place a negative in the negative carrier.

Using a masking frame or roll paper easel means that the projection plane is no longer on the level of the baseboard. This differential is ascertained and entered

6.0 Calibrating

Durst AC 800/AF-03/96

6.4 Autofocus and focus variator (only for Durst AC 800 AF)

6.4.1 Preparations

For programming the autofocus system kindly use the following flow chart. You can program the system for three different focal lengths (50, 80 or 105 mm). The focal lengths are allotted channels and processes. Before programming the autofocus system, the lens focal lengths must be fed into the paper calibration (CAL). Note The programming of the autofocus system is made easier by the use of the Durst-made and surface coated focusing magnifier. Order code: Proscop.

Start

Fit the unit with an enlarger lamp

Insert required mixing box and appropriate format mask

Place the focusing negative supplied in the film carrier

Switch on the unit

Into the film carrier’s bottom section insert the format mask matching the film size and a Bimagla AN glass into the film carrier’s top section. Note: When printing transparencies, insert the Bidia mask. In this case you will not be needing an AN glass. Film size 6 x 9 cm 6 x 7 cm

Mixing box AC 800Box 69

Format mask Binema 69 Binema 67 Bimagla AN

Lens 100/105 mm

6 x 6 cm 4,5 x 6 cm

AC 800Box 66

Binema 66/ Binema 45 Bimagla AN

80 mm

35 mm

AC 800Box 35

Binema 35 Bimagla AN

50 mm

„p“ appears on the display. The densitometer’s zero balance is carried out and the lens carrier moves to the reference setting; the projected image is then focused automatically. Note If the autofocus is not programmed (1st start up) the lens stage can move down (error 7 in the display). Remedy: Press the „Enter“ key.

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6.0 Calibrating

6.4.2 Steps for setting the autofocus

Does the „Foc. Var. Ill“ key LED light up?

Yes: set d, n figures to zero (see below) No: continue Set the positive variator to zero. Press and hold the „Foc. Var./Ill.“ key until „d“ is displayed. Release the „Foc. Var./Ill.“ key. Zero the value being displayed by pressing the +/- keys simultaneously. Set the negative variator to zero. Press and hold the „Foc. Var./Ill.“ key once - „n“ will appear on the display. Zero the value being displayed by pressing the +/- keys simultaneously. Pressing the „Foc. Var./Ill.“ key once more reverts the unit to the normal operating mode.

Call up the required mode by pressing and holding the „Enter“ key and by simultaneously touching the „Channel Mode Sel.“ key

Select the required memory channel

Switch on the calibration mode by pressing the „Set-up“ key

For feeding in the desired focal length press the +/- keys and store same by pressing the „Enter“ key Fit the appropriate lens

Neg. = Colour negatives Pos. = Colour transparencies B/W = Black-and-white negatives

Press the „Channel“ key till the desired memory channel is displayed: • Touch briefly: the indication increases + 1 • Keep pressing: the indication will be reduced (- 1) The display will be showing the channel, the calibration mode (Cal) and the focal length (50, 80 or 105). Note: Activating the exposure control calibration mode is only meant for storing the focal length. The lens aperture value will be displayed (e. g. F8).

Film size 24 x 36 4,5 x 6/6 x 6 6 x 7/6 x 9

Focal length 50 80 105

Lens board Setopla 2839 Lapla 39 Lapla 39

Enter F22 by pressing the +/- keys and store this value by pressing the „Enter“ key Move the enlarger head, depending on the focal length being used, to the following settings By pressing the „Enter“ and subsequently pressing the „Setup“ keys, the lens as well as various other values will be stored

Setting on metric scale 35 34 33

Focal length 50 mm 80 mm 105 mm

Note If Error 6 is indicated on the display, the metering range has been exceeded. Remedy: Touch the „Enter“ key. On the right-hand enlarger head side, push the plastic slide fully upwards. This turns on the enlarger lamp automatically and the display indicates „H“ (=head). Press the „Disp. Select“ key to call up the exposures for Y, M, C. If the exposure time for one of these colours is less than one second, the display will be flashing. With the calibration bolt turn the appropriate filter in the enlarger head till the exposure time is more than one second. Then press and hold the „Enter“ key, then press the „Setup“ key. „CALE“ must be displayed.

6.0 Calibrating

Durst AC 800/AF-03/96

k) l)

The calibration mode is switched automatically to „XCP“. Press „Setup“ key for three times.

The paper/film setup is thereby switched off.

Press and hold the „Enter“ key, then press the „Foc. Var/Ill.“ key

This switches on the AF setup-mode (programming the autofocus). The display indicates „SFOC“. The white-light mode is automatically switched on.

Press the +/- keys simultaneously

This cancels all reference points stored for this focal length. The unit confirms this by switching the enlarger lamp brief-off before turning it on again.

When using the 50 or 80 mm lens move the enlarger head all the way to the bottom. When using the 105 mm lens move the enlarger head to head elevation 29 of the metric scale. Press and hold the „Expose“ key, then press the „Light“ key. Press the „Light“ key to move the lens carrier down until the focus setting is exceeded Lightly touch the „W.Light“ key to move the lens carrier up to the focus setting (use a focusing magnifier to check the focus Is the image on the projection plane in focus?

Move colour head to next position. See adjacent table.

By lightly touching the „W. Light“ key, move the lens carrier up to the focus setting (use a focusing magnifier)

Durst AC 800/AF-03/96

This causes the lens carrier to move to the reference setting.

The up or down movement of the lens carrier is carried out in two speeds: - approx. 2 mm/sec. in the beginning - approx. 10 mm/sec. after about five seconds Important Always move the lens carrier to the final focus setting starting from below (using the „W. Light“ key) this to eliminate mechanical tolerances). Yes: Press and hold the „Enter“ key, then press the „Exppose“ key. This stores the new setting. To double check the unit automatically focuses the image based on the setting that has been entered. No: back to step o) Head elevation positions for the following lenses: 50 mm 80 mm 105 mm 17 18 29 21 19,5 31 30 21 34 55 24 39 92 30 47 50 60 92 92 Enlarger head settings on metric scale. Important Always move the lens carrier to the final focus setting starting from below (using the „W. Light“ key) this to eliminate mechanical tolerances.

6.0 Calibrating

Is the image on the projection plane in focus?

Repeat steps r) to s) until the enlarger head positions are focused under step r) and stored

Press and hold the „Enter“ key, then press the „Foc.Var./ill“ key

End

Yes: Press and hold the „Enter“ key, then press the „Expose“ key. This stores the new setting. To double check the unit automatically focuses the base on the setting that has been entered. No: back to step s)

This switches off the AF-setup-mode (SFOC) and the program reverts to the normal operating mode with automatic focusing. Note: If after having programmed the three focal lengths (50, 80, 105 mm) a paper-film channel is called up or programmed anew, the programming values (autofocus) of the appropriate focal length will automatically be transfered to that paper-film channel.

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Durst AC 800/AF-03/96

6.4.3 Subsequent correction

a) b)

Start Switch on the unit

A setup cycle will be running down. „p“ appears in the display. The densitometer is zeroed, and the lens carrier moves into the reference position, then focusing takes place automatically. Note If the autofocus is not programmed (during first use), the lens carrier may move into the bottom position (Error 7). Remedy: Press „Enter“ key.

Call up the memory channel of the focal length to be corrected

Press the „Channel“ key till the desired channel is displayed. • touch briefly: the indication increases + 1 • keep pressing: the indication will be reduced (- 1)

Fit enlarger with appropriate lens

Film size 24 x 36 4,5 x 6/6 x 6 6 x 7/6 x 9

Does the „F. Var/ill“ key LED light up?

Yes: Zero the „d“ and „n“ values. No: Continue

Focal length 50 80 105

Lens panel Setopla 2839 Lapla 39 Lapla 39

Set the positive variator to zero. Press and hold the „Foc. Var/ill“ key until „d“ is displayed. Release the „Foc. Var/ill“ key. Zero the value being displayed by pressing the +/- keys simultaneously. Set the negative variator to zero. Press the „F. Var/ill“ key once - „n“ will appear on the display. Zero the value being displayed by pressing the +/keys simultaneously. Pressing the „F. Var/ill“ key once more reverts the unit to the normal operating mode. f)

Place the focusing negative supplied in the film carrier Move the enlarger head to the setting to be corrected Press and hold the „Enter“ key, then press the „ F.Var/ill“ key

This switches on the setup-focus mode (programming of the autofocus). The display indicates „SFOC“. The unit is automatically switched to the white-light mode.

Press the „Light“ key to move the lens carrier down till the focus setting is exceeded

The up or down movement of the lens carrier is carried out in two speeds: • approx. 2 mm/sec. in the beginning • approx. 10 mm/sec. after about five seconds

Durst AC 800/AF-03/96

6.0 Calibrating

Lightly touch the „W. Light“ key to move the lens carrier up to the focus setting (use a focusing magnifier to check the focus) Press and hold down the „Enter“ key and then press the „Expose“ key

Important Always start from below when moving the lens carrier to the final focus setting (using the „W. Light“ key) this to eliminate mechanical tolerances. This stores the new setting. To double check the unit automatically focuses the image based on the setting that has been entered. Note If Error 7 will be indicated see section 8.0.

Is the image on the projection plane in focus?

Press and hold the „Enter“ key, then press the „F. Var/ill“ key

End

Yes: Continue No: Back to step j) If the corrected setting is already listed in the calibration table (section 6.4.2) (max. permissible deviation: 5 mm), the stored value is carried over; otherwise the new setting is inserted in the reference point table. This switches off the Af-setup-mode (SFOC) and the program reverts to the normal operating mode with automatic focusing.

6.0 Calibrating

Durst AC 800/AF-03/96

6.4.4 Manual focusing

Start

Switch on the unit

Special jobs may require manual focusing. For this kindly proceed as follows:

„P“ will be shown on the display. The densitometer will be balanced to zero and the lens carrier moves to the reference setting; the enlarger is then focused automatically.

Fit the enlarger with the appropriate lens

Film size 24 x 36 4,5 x 6/6 x 6 6 x 7/6 x 9

Press and hold the „Enter“ key, then press the „F. Var/ill“ key

The unit is switched to the Setup-Focus mode (programming of the autofocus system). SFOC will be shown on the display and the enlarger light is switched on automatically.

Focus the image

Press and hold the „Enter“ key, then press the „F. Var/ill“ key

Focal length 50 80 105

Lens panel Setopla 2839 Lapla 39 Lapla 39

For this press the „Light“ (down) or „W. Light“ (up) keys. The lens carrier’s up or down movement takes place in two speeds: • approx. 2 mm/sec. in the beginning • approx. 10 mm/sec. after about 5 sec. This switches off the AF-Setup-mode (programming of the autofocus system) and the program reverts to the normal printing mode. Note The autofocus sequence will take place once more only after changing the magnification.

End

6.4.5 Setting the focus variator to a raised/lowered projection level

When using a masking frame or a roll paper easel the projection plane will no longer be in focus. This differential is determined and fed in as follows.

Determining the distance

Use a ruler to ensure the distance between the baseboard’s projection plane and your new projection plane.

Press and hold the “F. Var./ill“ key

„d“ will be indicated on the display.

Key in the previously determined value of the differential

• With the +/- keys feed in the previously determined distance by pressing „+“ or „-“ key, according to the projection plane height. • If the projection plane is higher than the baseboard level, enter the distance by prefixing „-“ (minus); if the projection plane is below the baseboard level, enter the distance by prefixing „+“ (plus).

b) c)

Note Enter distance in „mm“. d)

Release the „F. Var./ill“ key

• An input is confirmed and checked by the lighting up of the red LED. Note The „Foc.Var“ key has an additional function. If this key is pressed briefly, all illuminations or displays will be extinguished. Pressing any key again returns to the display.

Durst AC 800/AF-03/96

6.0 Calibrating

6.5 Calibrating a memory channel for colour negatives/ slides

The memory channel is calibrated for a certain combination of film type, paper size and paper type.

6.5.1 Making preparations a)

Set the measuring cell slide-in unit’s (1) amplification switch to the correct position • Pull the measuring cell slide-in unit (1) out of the unit. • Push the switch (2) to the setting matching your process Neg or Pos. • Push the measuring cell slide-in unit (1) into the appropriate opening.

Call up the desired operating mode by pressing the „Enter“ and „Channel Mode sel.“ keys simultaneously

Neg. = Colour negatives Pos. = Colour transparencies B/W= Black-and-white negatives Press the „Channel“ key until the desired memory channel number is displayed.

Call up the desired memory channel

6.5.2 Setting pre-filter arrangement a)

Set the basic filtration

• Remove the calibration pin (1) on the right-hand side of the transformer housing. • Fully push the plastic slide (2) upwards on the enlarger head’s right. This switches on the enlarger lamp and the indication „H“ (= Head) will appear on the display. • Fit the calibration pin on the Y or M screw and turn same until the desired Y-M basic filtration value is indicated on the display. • For Neg: Y = 70, M = 50, C = 0. • For Pos: 000 close the slide again. • Press the „Light“ key to switch off the enlarger lamp.

6.0 Calibrating

Durst AC 800/AF-03/96

6.5.3 Activating the basic filtration a)

Switch to the calibration mode by pressing the „Setup“ key

On the display will be indicated the channel number, the calibration mode (Cal) and the lens focal length (L50, 80 or 105).

With the +/- keys feed in the desired lens focal length and store same by pressing the „Enter“ key

The display will then be showing the lens aperture (e. g. f8)

With the +/- keys feed in the desired lens aperture value and store same by pressing the „Enter“ key

Note If on the display the lens aperture indication is blinking, you can stop this by entering a smaller or larger aperture value. Note The lens aperture value that has been fed into the unit must be set on the lens.

Set the enlarger head to the correct position

Enter the memory values taken from the table supplied (section 6.2) and check

Move the enlarger head up or down until either one of the following indications, i. e. • M F 8 - with the 50 mm lens • M F 4 - with the 80 mm lens • M F 2 - with the 105 mm lens is extinguished. • With the „Disp. Select“ key call up the Y-M-C-D memories and check. • Display: Cy - Cm - Cc - Dd. • Using the „+/-“ keys, enter or modifiy the memory values.

6.5.4 Adapting the exposure time for individual filters with pre-filters a)

Press the „Light“ key to switch on the enlarger lamp

Place a correctly exposed Durst test negative in the film carrier

Focus projection (with Durst AC 800) or autofocus with Durst AC 800 AF

Check exposure times

Set to an exposure time of approx. 4 seconds

Durst AC 800/AF-03/96

Switch on the enlarger lamp and press the „Disp. Select“ key to call up, in sequential order, the Y-M-C exposure times, which will be indicated on the display. Display E = Exposure time. • Press the „Disp. Select“ key to call up the lens aperture indication. • Select a lens aperture, pressing the +/- keys, so that cyan yields an exposure time of approx. 4 seconds. Factory settings (section 6.2) were determined using F-Stop 8 (lens 50 and 105). • Press the „Disp.Select“ key once more to call up the exposure time indication and check. • Acceptable tolerance limit = ± 0,1 second

6.0 Calibrating

If the deviation of ± 0.1 sec. is exceeded, the exposure times must be matched to each other by pre-filtration

• Pull the calibration pin out of its holder on the transformer housing. • Push the plastic slide upwards on the enlarger head’s right. • Fit the calibration pin on the Y-M filter screw and turn the same until the Y and M exposure match the C exposure time. • In the table in Section 6.2 the pre-filter settings are given with the relevant filter times for the factory pre-calibrations. Note Normally there are only two filters that may be moved into the light path. If because of material characteristics it becomes necessary to add cyan filtration, another filter must be set to zero.

Set the correct lens aperture value on the lens

6.5.5 Continuing and finishing basic calibration a) b)

d) e)

Prepare the test exposure

Locate masking frame or roll paper easel so that the 70 grey patch is exposed.

Press the „Light“ key to switch off the enlarger lamp Insert a sheet of enlarging paper and expose

• Trigger the exposure by pressing the „Expose“ key. Note The 70 grey patch must be exposed.

Process the enlarging paper Carry out the zero balance for the densitometer

For this press and hold the „Enter“ key. Then press the „Bal. Adjust“ key. This will result in a blue, green and red reference measurement. Note Do the zero balance shortly before the reference measurement.

Take a reading of the test print’s 0.70 grey patch

• First hold the test print against the room’s light source and, on the back of the print, mark the 0.70 grey patch with a circle. • Press the „Light“ key to switch on the enlarger light. • Push the test print underneath the reflection densitometer’s holder so that the 0.70 grey patch is metered. Center with the aid of the mark made before. Note The grey patch must face the metering opening. • Press the „Bal. Adj.“ key. The test print will now be measured automatically and the memory values corrected.

With the „Disp. Select“ key call up the Y-M-C-D memories and make a note of the new memory values

6.0 Calibrating

Durst AC 800/AF-03/96

Do the memory values differ from the previous ones?

The values are stored in the memories by pressing and holding the „Enter“ key and, thereafter, the „Setup“ key

Yes: back to step 6.5.5 c) No: continue with step i (the display shows „0 000“) A metering cycle is triggered. Als Bestätigung erscheint die Anzeige CALE für Calibration. This ends the calibration mode for the basic memory. The program automatically switches to „XCP“.

6.5.6 Calibrating for maximum „XCP“ enlargement (compensation of reciprocity effect) a)

Enter the aperture with the „+/-“ keys which was last set when the calibration figures for the basic memory CAL were stored, and transfer the aperture to the lens. Pressing the „Enter“ key stores the aperture figure. Move the enlarger head to the correct position

Focus the projection (with Durst AC 800) or autofocus (with Durst AC 800 AF)

Enter the memory values taken from the table supplied (section 6.2) and check

Prepare a test exposure

Load the photo-paper, expose and process

Carry out the zero balance for the densitometer

Move the enlarger head up or down until either one of the following indications is extinguished: • M F 17 - for the 50 mm lens • M F 10 - for the 80 mm lens • M F 7 - for the 105 mm lens Press the „W. Light“ key to switch on the enlarger lamp. • Set the lens to the largest aperture. • Focus the projected image. • Set the lens aperture to the value used before. • Press the „W. Light“ key to switch off the enlarger lamp. • With the „Disp. Select“ key call up the Y-M-C-D memories and check. • Display: Cy - Cm - Cc - Dd. • With the +/- keys enter and if necessary modify the memory values. • Switch on the enlarger lamp. • Locate the masking frame or roll paper easel so that the 0.70 grey patch is exposed. • Trigger the exposure by pressing the „Expose“ key. Note The 70 grey patch must be exposed. For this press and hold the „Enter“ key, then press the „Bal. Adjust“ key. This will result in a blue, green and red reference measurement. Note Do the zero balance shortly before the reference measurement.

Durst AC 800/AF-03/96

6.0 Calibrating

Take a reading of the test print’s 0.70 grey patch

With the „Disp. Select“ key call up the Y-M-C-D memories and make a note of the new memory values Do the memory values differ from the previous ones?

Yes: back to step f) No: Confirmation by display „0 000“ and continue with step k)

The values are stored by pressing and holding the „Enter“ and subsequently pressing the „Setup“ key

A metering cycle is triggered. The „SLPE“ (Slope Enter) appears to confirm the calibration made. The calibration mode continues automatically with „LN“.

6.5.7 Calibrating for under-exposed „LN“ negatives/overexposed slides a)

„LN“ and the entered aperture are displayed. If the display flashes, the exposure time is too short. This is remedied by setting the next higher aperture. (Remember: transfer the aperture to the lens!) Move the enlarger head to the correct position

Move the enlarger head up or down until either one of the following indications is extinguished: • M F 8 - for the 50 mm lens • M F 4 - for the 80 mm lens • M F 2 - for the 105 mm lens

Place an underexposed Durst test negative or an overexposed test transparency in the negative carrier Focus the projection (with Durst AC 800), or autofocus (with Durst AC 800 AF)

• Press the „W. Light“ key to switch on the enlarger lamp. • Set the lens to the largest aperture. • Set the lens aperture to the value used before. • Press the „W. Light“ or „Expose“ keys to switch off the enlarger lamp.

6.0 Calibrating

Durst AC 800/AF-03/96

Enter the memory values taken from the table supplied (section 6.2) and check

Prepare a test exposure

Load the photo-paper, expose and process

Carry out the zero balance for the densitometer

• With the „Disp. Select“ key call up the Y-M-C-D memories and check. • Display: Cy -Cm - Cc - Cd. • With the +/- keys enter and if necessary modify the memory values. • Switch on the enlarger lamp with the „Light“ key. • Locate the masking frame or roll paper easel so that the 0.70 grey patch is exposed. • Switch off the enlarger lamp by pressing the „Light“ key. • Trigger the exposure by pressing the „Expose“ key. Note The 70 grey patch must be exposed. For this press and hold the „Enter“ key, then press the „Bal. Adjust“ key. This will result in a blue, green and red reference measurement. Note Do the zero balance shortly before the reference measurement.

Take a reading of the test print’s 0.70 grey patch

With the „Disp. Select“ key call up the YM-C-D memories and make a note of the new memory values Do the memory values differ from the previous ones?

The values are stored by pressing and holding the „Enter“ and subsequently pressing the „Setup“ key

Durst AC 800/AF-03/96

Yes: back to step g) No: confirmation by „0 000“ as display and continue with step e) A blue-green-red metering cycle will be triggered. Memory confirmation by display „LNEn (LN Enter). The calibration mode continues automatically with „DN“.

6.0 Calibrating

6.5.8 Calibrating for over-exposed „DN“ negatives/underexposed slides a)

If the display flashes when the previously used aperture is entered, the exposure time is again not ideal, and can be corrected by changing the aperture („+/-“ key). The change in aperture must again be transferred to the lens. Pressing the „Enter“ key stores the aperture setting Load the over-exposed Durst test negative or under-exposed test slide in the film carrier (use „over (+2)“ negative) Enter the memory values taken from the table supplied (section 6.2) and check

Prepare a test exposure

Load the photo-paper, expose and process

Carry out the zero balance for the densitometer

Do not change enlarger head and lens aperture settings.

• With the „Disp. Select“ key call up the Y-M-C-D memories and check. • Display: Cy - Cm - Cc - Cd. • With the +/- keys enter and if necessary modify the memory values. • Switch on the enlarger lamp with the „Light“ key. • Locate the masking frame or roll paper easel so that the 0.70 grey patch is exposed. • Switch off the enlarger lamp by pressing the „Light“ key. • Trigger the exposure by pressing the „Expose“ key. Note The 70 grey patch must be exposed. For this press and hold the „Enter“ key, then press the „Bal. Adjust“ key. This will result in a blue, green and red reference measurement. Note Do the zero balance shortly before the reference measurement.

Take a reading of the test print’s 0.70 grey patch

With the „Disp. Select“ key call up the YM-C-D memories and make a note of the new memory values

6.0 Calibrating

Durst AC 800/AF-03/96

Yes: back to step e) No: confirmation by display „0 000“, continue with next step.

Do the memory values differ from the previous ones?

The values are stored by pressing and holding the „Enter“ and subsequently pressing the „Setup“ key

A metering cycle will be triggered. Storage of the readings is confirmed by the display „DNEn“ (for DN Enter).

6.5.9 Automatically ending the calibration mode

After confirmation of storage the calibration operation ends automatically. Normal operation starts.

6.6 Calibrating a memory channel for black/white enlargements

Note The automatic calibration works only for a medium gradation of approx. 3.

6.6.1 Preparations a)

Set the measuring cell slide-in unit’s (1) amplification switch to the correct position

• Pull the measuring cell slide-in unit (1) out of the unit. • Set the switch (2) to B/W. • Push the measuring cell slide-in unit (1) into the appropriate opening.

Select the „B/W“ operating mode by simultaneously pressing the „Enter“ and „Channel-Mode Sel.“ key Call up the desired memory channel

Durst AC 800/AF-03/96

B/W = Printing black-and-white negatives.

Press the „Channel“ key until the desired memory channel number is displayed.

6.0 Calibrating

6.6.2 Setting pre-filters

• Remove the calibration pin (1) on the right-hand side of the transformer housing. • Fully push the plastic slide (2) upwards on the enlarger head’s right. This switches on the enlarger lamp and the indication „H“ (= Head) will appear on the display. • Fit the calibration pin on the Y-M-C screw and turn same until all filters have reached their mechanical stop (the display mustn’t necessarily indicate zero). If necessary set the grey value by moving in all three filters by the same amount. • Close the plastic slide (2) again. • Press the „Light“ key to switch off the enlarger lamp. Note The exposure times must be matched to the time whose pre-filter is on mechanical zero stop (normally the cyan filter).

6.6.3 Basic „CAL“ calibration a)

Switch to the calibration mode by pressing the „Setup“ key With the +/- keys feed in the desired lens focal length and store same by pressing the „Enter“ key With the +/- keys feed in the desired lens aperture value and store same by pressing the „Enter“ key

On the display will be indicated the channel number, the calibration mode (Cal) and the lens focal length (L50, 80 or 105). The display will then be showing the lens aperture (e. g. f8)

Set the enlarger head to the correct position

Press the „Light“ key to switch on the enlarger lamp

Place a correctly exposed test negative in the film carrier

Move the enlarger head up or down until either one of the following indications, i. e. • M F 8 - with the 50 mm lens • M F 4 - with the 80 mm lens • M F 2 - with the 105 mm lens is extinguished.

6.0 Calibrating

Durst AC 800/AF-03/96

Focus projection (with Durst AC 800) or autofocus with Durst AC 800 AF

Check exposure times

Set to an exposure time of approx. 4 seconds

Switch on the enlarger lamp, press the „Disp. Select“ key. The exposure time will then be indicated on the display. Display E = exposure time. • Press the „Disp. Select“ key to call up the lens aperture indication. • Select a lens aperture, pressing the +/- keys, so that cyan yields an exposure time of approx. 4 seconds. • Press the „Disp.Select“ key once more to call up the exposure time indication and check. • Acceptable tolerance limit = ± 1 second • Set the correct aperture value on the lens.

Prepare the test exposure

Load the photo-paper, expose and process.

• Locate masking frame or roll paper easel so that the 70 grey patch is exposed. • Press the „Light“ key to switch off the enlarger lamp. Make a test exposure sequence by modifying the density values being displayed as follows: -30/-15/0/ +15/+30. • With the „Disp. Select“ key call up the density memory channel. • Display: CD. • With the +/- keys enter the memory value. • Trigger the exposure by pressing the „Expose“ key. Note The 70 grey patch must be exposed.

Carry out the zero balance for the densitometer

• For this press and hold the „Enter“ key. Then press the „Bal. Adjust“ key. This will result in a blue, green and red reference measurement. Note Do the zero balance shortly before the reference measurement.

Take a reading of the test print’s 0.70 grey patch

With the „Disp. Select“ key call up the D memory and make a note of the new memory value

Do the memory values differ from the previous ones?

Store the calibration value in the „Cal“ mode

Durst AC 800/AF-03/96

Yes: back to step k) No: confirmation by display „0 000“ For this press and hold the „Enter“ key, then press the „Setup“ key. Make a note of the lens aperture. Confirmation by „CAL“ display (for calibration). The calibration mode automatically continues with „XCP“ („XCP“ is displayed).

6.0 Calibrating

6.6.4 Calibrating for maximum enlargement (compensation of „XCP“ reciprocity effect a)

Enter the aperture with the „+/-“ keys which was last set during storage of the calibration figures for the basic „CAL“ memory, and transfer the aperture to the lens. Pressing the „Enter“ key stores the aperture figure.

Move the enlarger head to the correct position

Focus the projection (with Durst AC 800) or autofocus (with Durst AC 800 AF)

Prepare the test exposure

Load the photo-paper, expose and process

Carry out the zero balance for the densitometer

Move the enlarger head up or down until either one of the following indications is extinguished: • M F 17 - for the 50 mm lens • M F 10 - for the 80 mm lens • M F 7 - for the 105 mm lens Press the „W. Light“ key to switch on the enlarger lamp. • Set the lens to the largest aperture. • Focus the projected image. • Set the lens aperture to the value used before. • Press the „W. Light“ key to switch off the enlarger lamp. • Switch on the enlarger lamp. • Locate masking frame or roll paper easel so that the 0.70 grey patch is exposed. • With the „Disp. Select“ key call up the density memory. • Display: CD. • With the +/- keys enter and if necessary modify the memory values. • Press the „Light“ key to switch off the enlarger lamp. • Trigger the exposure by pressing the „Expose“ key. Note The 70 grey patch must be exposed. For this press and hold the „Enter“ key, then press the „Bal. Adjust“ key. This will result in a blue, green and red reference measurement. Note Do the zero balance shortly before the reference measurement.

Take a reading of the test print’s 0.70 grey patch

6.0 Calibrating

Durst AC 800/AF-03/96

With the „Disp. Select“ key call up the D memories and make a note of the new memory values

Do the memory values differ from the previous ones?

Yes: back to step e) No: confirmation by display „0 000“ and continue with next step A deviation of +/- 2 figures here is acceptable.

The values are stored by pressing and holding the „Enter“ and subsequently pressing the „Setup“ key.

Another reading cycle takes place. Storage is confirmed by „SLPE“ in the display. The calibration mode continues automatically with „LN“. „LN“ is displayed and the entered aperture.

6.6.5 Calibrating for under-exposed „LN“ (Light Negative) negatives/over-exposed slides

Under-exposed negatives or over-exposed slides are calibrated for BW enlargements with the normal „CAL“ calibration. The density correction therefore does not need to be set to zero in this step.

With the +/- keys enter the lens aperture that has been used in the „Cal“ mode and store this value by pressing the „Enter“ key

Set the lens aperture to this value.

Move the enlarger head to the correct position

Set density figure to zero.

The values are stored by pressing and holding the „Enter“ and subsequently pressing the „Setup“ key

6.6.6 Calibrating for over-exposed „DN“ (Dark Negative) negatives/under-exposed slides a)

b) c)

Move the enlarger head up or down until either one of the following indications is extinguished: • M F 8 - for the 50 mm lens • M F 4 - for the 80 mm lens • M F 2 - for the 105 mm lens • Using the „Disp. Select“ key select the density „D“. • Set to zero by simultaneously pressing the „+/-“ keys. A reading cycle takes place whose figures are then stored (confirmation by the display „LNEn“, LN Enter). The calibration mode automatically continues with „DN“.

Also in this case the procedure is the same as for „LN“. The following steps explain again only the zero-setting of density and how to memorize.

Enter the previously set aperture with the „+/-“ key and store by pressing the „Enter“ key Set the density to zero

• Using the „Disp. Select“ key select the density „D“. • Set to zero by simultaneously pressing the „+/-“ keys.

The values are stored by pressing and holding the „Enter“ and subsequently pressing the „Setup“ key

A reading cycle takes place whose figures are then stored (confirmation by the display „DNEn“, e.g. DN Enter on the display). The calibration mode automatically continues with the normal mode.

Durst AC 800/AF-03/96

6.0 Calibrating

6.6.7 Retrieving and noting the stored figures a)

Retrieving filter and density figures in the basic „CAL“ memory

• Pressing the „Set-up“ key switches the enlarger into the calibration mode again. • After the focal length and aperture have been confirmed with „Enter“, the colour head must be moved to the right enlarging position (MF 8 with 50 mm lens). • Using the „Disp.Select“ key retrieve the filter and density correction figures and note them in the table (page 45).

Recall filtration and density values of XCP-LN and DN

• After the „Set-up“ key has been pressed, the next „XCP“ calibration mode is displayed, whose figures can be displayed consecutively with the „Disp. Select“ key. • The procedure is the same for the next two memory channels.

Pre-filtration settings

Since the variations in filter exposure time are not very great (up to 30 %) for different film and paper figures (that is different memory channels), it is advisable to set the pre-filtration only when the first memory channel is calibrated, and to leave the figure the same for the remaining memory channels. The exposure times are checked, with the enlarger light on, by means of the „Disp. Select“ key. The filter figures (C) are shown first, then the exposure times (E) for the various colours. Steps for retrieving the pre-settings: • Leave the Set-up mode (the Set-up LED goes out). • Pushing up the plastic slide on the right-hand side of the colour head shows the display „H“. • With the „Disp. Select“ key the various pre-settings are retrieved, and can be entered in the following table.

6.0 Calibrating

Durst AC 800/AF-03/96

Channel no. mode

Film type

Size/ Aperture

Paper type

Filter

Cal

XCP

Y M C D Y M C D Y M C D Y M C D Y M C D Y M C D Y M C D Y M C D

Durst AC 800/AF-03/96

6.0 Calibrating

6.7 Pre-production test 6.7.1 Pre-production test for colour negatives/slides a)

The enlarger is in the normal mode. Make 10 to 15 prints 20 x 25 cm (8 x 10 in.) in size from typical customer negatives or transparencies (these film originals should be correctly exposed and free of extremely predominant colours) of the film type just programmed (preproduction test)

• Press the „Light“ key to switch on the enlarger light. • Place the negative in the negative carrier. • Open the lens diaphragm fully and focus the projection (with Durst AC 800), or autofocus (with Durst AC 800 AF). • Stop the lens down again. Note The lens aperture value indicated on the display must match the aperture setting on the lens. • Switch off the enlarger lamp. • Insert enlarging paper. • Trigger the exposure.

After processing judge the test prints’ colour balance and density and if necessary correct the basic memory (section 6.8)

6.7.2 Pre-production test for BW negatives a)

The pre-production test is in principle the same as for colour negatives/slides, and only the test prints need their density checking

6.0 Calibrating

Durst AC 800/AF-03/96

6.8 Adapting memory to production 6.8.1 Correcting colour negatives/slides a)

Correct memory values

• With the „Disp. Select“ key call up the appropriate colour and density channel (Y-M-C-D). • With the +/- keys enter the required correction values. • By pressing and holding the „Enter“ key and by subsequently pressing the „Setup“ key the correction values just entered are fed into the basic memory. On the display zero will be indicated once more. If the corrections are required for just one of the XCP-LNDN calibration modes, the memory values of the calibration mode concerned are to be corrected as follows: • Press the „Setup“ key repeatedly to call up the required calibration mode. • With the +/- keys enter the appropriate value and store same by pressing the „Enter“ key. • With the „Disp. Select“ key call up the appropriate colour and density channel (Y-M-C-D). • Place the corresponding test negative in the negative carrier. • Press and hold the „Enter“ key, then press the „Setup“ key. • Press the „Setup“ key repeatedly to switch to the normal printing mode.

Repeat the preproduction test (step 6.7.1a) If the result is satisfactory, produce a 20 x 25 cm test print from a normally exposed Durst test negative or slide Enter the „Cal-XCP-LN-DN“ memory values in the table supplied (section 6.6.7)

With the „Setup“ key call up the „Cal-XCP-LN-DN“ calibration modes and with the „Disp. Select“ key the Y-M-C-D memory values and make a note thereof.

With the „Setup“ key switch back to the normal printing mode

The programming of a channel is thus completed.

Durst AC 800/AF-03/96

6.0 Calibrating

6.8.2 Correcting BW negatives a)

Correct the memory value

The steps here are also basically the same. • With the „Disp. Select“ key call up the density channel. • With the +/- keys enter the required correction value. • To feed the entered correction value into the basic memory, press and hold the „Enter“ key, then press the „Setup“ key. The display will indicate zero once more. Note If corrections are required for XCP, modify the memory values as follows: • Press the „Setup“ key to call up the desired calibration mode. • With the +/- keys enter the appropriate lens aperture value and store same by pressing the „Enter“ key. • With the „Disp. Select“ key call up the density channel.

Enter the figure stored for „CAL-XCP“ in the table in Section 6.6.7 With the „Setup“ key switch back to the normal printing mode

With the „Setup“ key call up the calibration modes „CalXCP“ and with the „Disp. Select“ key call up the D memory values and make a note thereof. The programming of a channel is thus finished.

6.0 Calibrating

Durst AC 800/AF-03/96

Practical work

7.0

7.1 Preview

Switching on Making preparations Setting focus variator Setting enlargement Possibly manual correction of: a) focus b) colour and density Printing a different film or paper type Ending

Durst AC 800/AF-03/96

After calibration has ended, the enlarger automatically switches from the set-up mode to working mode. The following flow chart provides a preview of the individual steps. Section 7.2.1 Section 7.2.2 Section 7.2.3 Section 7.2.4 a) Section 6.4.3 b) Section 7.2.5

Section 7.2.6 Section 7.2.7

7.0 Practical work

7.2 Steps 7.2.1 Switching on a)

„P“ will be indicated on the display. • A blue-green-red metering cycle will be taking place. The resulting values are automaticaly stored by the reflection densitometer and will be used as reference grey for further measurements. • At the end of the metering cycle the enlarger lamp is switched off automatically; the unit is ready for operation. On the display will now be shown the operating mode (Neg-Pos-B/W), the channel being used and the lens aperture value.

Switch the unit on with the mains switch on the transformer housing

Note If on the display the lens aperture indication were to blink, enter a smaller or larger lens aperture value.

7.2.2 Making preparations a) b)

Select the desired memory channel

Press the „Channel“ key until the number of the desired memory channel is displayed.

Call up the appropriate operation mode (Neg-Pos-B/W) by simultaneously pressing the „Enter“ and „Channel-Mode-sel“ keys.

Neg.= colour negative printing Pos.= colour transparency printing B/W = black-and-white negative printing

Set the measuring cell slide-in unit’s (1) amplification switch to the correct position

• Pull the measuring cell slide-in unit (1) out of the unit. • Push the switch (2) to the setting matching your process Neg, Pos or BW. • Push the measuring cell slide-in unit (1) into the appropriate opening.

7.0 Practical work

Durst AC 800/AF-03/96

Fit desired mixing box and appropriate format mask

Mixing box AC 800Box 69

Format mask Binema 69 Binema 67 Bimagla AN

Lens 100/105 mm

6 x 6 cm 4.5 x 6 cm

AC 800Box 66

Binema 66/ Binema 45 Bimagla AN

80 mm

35 mm

AC 800Box 35

Binema 35 Bimagla AN

50 mm

7.2.3 Setting the focus variator a)

b) c) d)

Using a masking frame or roll paper easel means that the projection plane is no longer on the level of the baseboard. This differential is ascertained and entered as follows. Determining the distance Press and hold the “F. Var./ill“ key Key in the previously determined value of the differential

Use a ruler to ensure the distance between the baseboard’s projection plane and your new projection plane. „d“ will be indicated on the display. • With the +/- keys feed in the previously determined distance by pressing „+“ or „-“ key, according to the projection plane height. • If the projection plane is higher than the baseboard level, enter the distance by prefixing „-“ (minus); if the projection plane is below the baseboard level, enter the distance by prefixing „+“ (plus). Note Enter distance in „mm“.

Release the „F. Var./ill“ key

• An input is confirmed and checked by the lighting up of the red LED. Note The „Foc. Var“ key has an additional function. If this key is pressed briefly, all illuminations or displays will be extinguished. Pressing any key again returns to the display.

Durst AC 800/AF-03/96

7.0 Practical work

7.2.4 Setting the enlargement a)

b) c)

Press the „Light“ key to switch on the enlarger lamp Place a film strip in the negative carrier Open the lens aperture fully and adjust the enlarger head to obtain the desired print size Focus projection (with Durst AC 800) or autofocus (with Durst AC 800 AF). With the +/- keys enter the desired lens aperture value

Set the lens aperture on the lens

Note If the aperture display flashes (sign of a poor exposure time), you can stop this by entering a smaller or larger aperture. Note The lens aperture value being displayed must match the lens aperture setting of the lens.

Press the „Light“ key to switch off the enlarger lamp Load the photo-paper, expose and process. Expose by pressing the „Expose“ key To make another print of the same film or paper type, repeat Section 7.2.4.

7.0 Practical work

Durst AC 800/AF-03/96

7.2.5 Manual colour and density corrections

Select the colour or density to be corrected with „Disp. Select“

The correction can be made with the „+/-“ keys.

The enlarger is in normal mode. Generally production is satisfactory, but individual prints need correcting. In these cases manual corrections can be made. They apply only to the relevant enlargement, and are normally automatically deleted for the next setting. If two enlargements with the same corrections occur, the correction figures can be fixed by pressing the „Hold“ key.

If the remote control is used, the corrections are entered with the numerical keyboard and the relevant colour/density correction keys.

It applies to the current enlargement. If the „Hold“ function is activated (green light on the „Hold“ key), the correction applies to all further prints. If the key is pressed again, now only the calibrated filter and density figures apply (green light goes out).

7.2.6 Printing a different film or paper type

If enlargements of another film or paper type must be produced, select the suitably calibrated memory channel and make the other preparations. To do this, start with Step 7.2.2 a), and then carry out all the following steps.

7.2.7 Ending

Switch off the AC 800 with the main switch. Note Keeping the unit at operating temperature will ensure best results. Therefore, after longer periods without exposures, switch on the enlarger lamp for a short time.

Durst AC 800/AF-03/96

7.0 Practical work

7.3 Using the „Automatic density control and fixed filtration“ function („VXFF“ key) a)

Load the negative, focus the image (only for Durst AC 800), and produce a test print (press the „Expose“ key)

After processing correct any colour and density faults, and fix the corrections by pressing the „Hold“ key (see Section 7.2.5)

Pressing the „VXFF“ key retains the colour and density corrections found by the reading for the next prints (a similar negative). The enlarging scale can be changed at will, since the reciprocity effect is automatically compensated and the exposure time is matched to the density to be retained („VX“ variable exposure time)

If the „VXFF“ key is pressed again, the „LED“ goes out and the function is ended

This function is mainly used for studio photographs, since the filter settings of these are frequently the same.

7.0 Practical work

Durst AC 800/AF-03/96

7.4 Using the „Fixed exposure time and filtration“ function („FXFF“ key): producing contact prints

If you produce an enlargement under this function, the colour and density reading is not made during the exposure as usual, but the previous enlargement readings are automatically adopted. The „FXFF“ function is primarily for producing contact prints. Since the film material with this type of exposure is not in the film carrier but on the projection level, with the normal mode the reading cells mounted underneath the film carrier would be disturbed by the approximately white light. Only error warnings such as „Wrong aperture setting“ (aperture number flashes) would be displayed. The steps for setting contact prints now follow.

First load the negative to be printed in the film carrier, and set the enlargement to match the space needed by the negative strip on the projection area After focusing (manually with the Durst AC 800), make a blank exposure (no photo-paper) (press the „Expose“ key). This automatically measures the colour and density Pressing the „FXFF“ key (LED shows red) stores the readings and keeps them for the next exposure

Take the negative out of the film carrier and put it on the baseboard together with the other strips

Position the negative strip for the contact print over the photo-paper on the projection level. It is possible to use a contact frame or sheet of glass

Make the exposure („Expose“ key) and process the contact print If no more contact prints are needed, the „FXFF“ function is ended by pressing the „FXFF“ key (LED goes out)

Durst AC 800/AF-03/96

7.0 Practical work

7.5 Distortion control

Converging verticals cannot always be avoided when a shot is taken. With the AC 800 complete distortion control is possible by tilting the enlarger head and the lens plane. There are scales on the enlarger to permit repeats.

Procedure • Load the negative to be corrected and focus it. • Fix the required head position by turning the handle (1). • Pivot the colour head by loosening the knob (2) to the required side. The head must always be held firm with one hand. It can be panned in both directions by 45°. A scale (3) indicates the angle, and so permits accurate repeats. Fasten in the required position again with the knob (2). • To permit the lens carrier to be pivoted, loosen the screw (4). The lens will now slide and pivot, and two scales (5) show the rectification, and so ensure simple repetition. The required position is fixed by fastening the screw (4). • Focus by slanting the mask frame.

7.0 Practical work

Durst AC 800/AF-03/96

Troubleshooting table and explanations of error warnings

8.0

Signal/fault

Cause or problem

Lens aperture indication blinks

Too long or too short an exposure (acceptable exposure time 1 - 300 sec) Possible causes: a) Lack of measuring cell slide-in unit or amplification switch is not on the setting of your process. b) No negative or transparency in the negative carrier. c) Lens aperture too large or too small.

Remedy

a) Fit measuring cell slide-in unit and get the amplification switch to the position of your process. b) Insert negative or transparency c) Enter smaller or larger lens aperture

No digital display

„F. Var./ill“ key has been pressed.

Press the „F. Var./ill“ key.

Desired operating mode (Neg-PosB/W) can’t be selected

Functions only in print mode.

Press the „Setup“ key to call up the print mode. Press and hold the „Enter“ key, then with the „Mode Sel.“ key select the desired process. Attention Set the amplification switch of the measuring cell slide-in unit to the appropriate position.

In the calibration mode (Cal-XCP-LNDN) the memory values can’t be modified or the enlarger lamp can’t be switched on

Calibration conditions not fulfilled. Enlarger head position incorrect. Display in CAL, LN, DN MF 8 for the 50 mm lens MF 4 for the 80 mm lens MF 2 for the 100/105 mm lens

Adjust the enlarger head until said indication disappears.

Display in: XCP MF 17 for the 50 mm lens MF 10 for the 80 mm lens MF 7 for the 100/105 mm lens Manually entered correction values are erased after each exposure

Durst AC 800/AF-03/96

Exposure made without actuating „Hold“ function.

Key in correction values and press the „Hold“ key. Correction values will be kept for the following exposures.

8.0 Troubleshooting table and explanations of error warnings

Error indication

Cause or problem

Remedy

Err 0

Upper mixing shaft sensitivity limit

Contact the service department of your Durst agency

Err 1

Lower mixing shaft sensitivity limit

Contact the service department of your Durst agency

Err 2

Upper negative sensitivity limit

Set amplification switch to correct position (Neg-Pos-BW) on the bottom of the measuring cell slide-in unit. If the fault can’t be remedied with this, contact the service department of your Durst agency

Err 3

Lower negative sensitivity limit

Err 4

Upper sensitivity limit of the built-in reflection densitometer. Wrong original (completely white)

Take a reading of the correct original (0.70 patch). If the fault can’t be remedied, contact the service department of your Durst agency

Err 5

Upper sensitivity limit of the built-in reflection densitometer. Wrong original (completely dark)

Take a reading of the correct original (0.70 patch). If the fault can’t be remedied, contact the service department of your Durst agency

Err 6

Computer overflow of the automatic memory value determination.

Set the previous (Y-M-C-D) memory values and take another reading of the test exposure (0.70 patch). If the fault can’t be remedied, contact the service department of your Durst agency

When you program the autofocus you can store up to 20 base points per lens. If the 20 points are exceeded, the display shows Error 6!

Press the „Enter“ key. Delete all the base points and recalibrate the enlarger by selecting suitable base points.

Faulty electronics

Contact the service department of your Durst agency

The lens carrier locks

Press the „Enter“ key or on/off switch. If the fault recurs frequently, please contact the after-sales service department of your authorised Durst agent

Err 8

Faulty enlarger head position measurement signal

Check cable connections. If the fault can’t be remedied, contact the service department of your Durst agency

Err 9

Calibration values have been erased

Enter calibration values once more, i.e. calibrate the unit anew

Brightly lit E on the display

Calibration values have been erased

Enter calibration values once more, i.e. calibrate the unit anew

Err 7

8.0 Troubleshooting table and explanations of error warnings

Durst AC 800/AF-03/96

Maintenance and care

9.0

The Durst AC 800 resp. AC 800 AF is designed for heavyduty use with minimum maintencance. It retains its high efficiency even in the most demanding operating conditions. Periodically grease the self-coiling counterweight spring at the rear of the enlarger column with vaseline or mineral oil. Depending on the amount of use of the enlarger, the counterweight spring is subject to constant wear which can eventually lead to cracks along both edges. Regularly check the counterweight sprint uncoil it by lowering the enlarger head to the bottom of the column. Important: If the counterweight spring shows signs of damage it would be replaced immediately. To avoid injuries to darkroom personnel this operation should be carried out by the service department of your agency in your country. Periodically dust the negative carrier glasses and lenses with a chamois leather or antistatic brush or cloth. Periodically also clean the colour filters of the colour head with a wad of cotton wool soaked in alcohol. Diffusers of the mixing boxes and the heat filter below the tungsten-halogen lamp of the colour head should also be cleaned regularly. Before opening the colour head for servicing or for changing the tungsten-halogen lamp always check that the unit is desconnected from the mains supply. For safety, unplug the mains lead from the supply socket. Fuses Before replacing defect fuses, the power cable must be disconnected from the socket. Fuses are located at the back side of the power unit (specifications are indicated). If after the replacement of fuses the error still persists or if the source fuse needs to be replaced more often call a qualified service technician. Maintenance and care of the autofocus (AC 800 AF only) The spindle and the guiding rails of the lens stage need a special treatment every 6 months. They should be cleaned and a special grease should be used for smooth operation. We recommend Isoflex Topas AK 50.

Durst AC 800/AF-03/96

9.0 Maintenance and care

Special accessories

10.0

Description

Order code

Accessories for the lighting system Mixing boxes for film sizes up to 6 x 6 cm

AC 800 Box 66

As above, but up to 24 x 36 mm

AC 800 Box 35

Accessories for the film carrier

AC 800 Box 66

Format masks for 6 x 9 cm films are fastened in the film carrier instead of the glasses

Binema 69

As above, but for 6 x 6 cm

Binema 66

As above, but for 4.5 x 6 cm

Binema 45

As above, but for 4.5 x 6 cm

Binema 45 H

As above, but for 24 x 36 cm

Binema 35

As above, but for 110 film

Binema 110

As above, but on request for special sizes (only DIN or ASA standards). The delivery period for special sizes is approx. 30 days.

Binema S

Special masks for mounted 35 mm slides for use in Cobineg film carriers

Bidia

Accessory for lens mounting

Setopla

Lens circuit boards for 50 mm lenses with M 39 threads

Setopla 2839

Lens circuit boards for 80 - 105 mm lenses with M 39 threads

Lapla 39

Lens circuit boards for 80 - 105 mm lenses with M 50 threads

Lapla 50

Adapter ring for using lenses with M 25 threads on lens circuit boards and extension tubes with M 39 threads Flaring

Flaring

Lens extension tube for 1:1 enlargements

Femotub

Film size

Lens focal length

Lens board platine

24 x 36 mm 4.6 x 6/ 6 x 6 cm 6 x 7/ 6 x 9 cm

50 mm

Setopla 2839

80 mm

Lapla 39

105 mm

Lapla 39

Femotub

10.0 Special accessories

Durst AC 800/AF-03/96

AC 800 Wallmount

AC 800 Controll

Description

Order code

General accessories Special wallmount for big enlargements on the floor, also suitable for the AC 800/ AC 800 AF used with the roll paper magazine

AC 800 Wallmount

Portable remote control with numerical keys with the following functions: • manual colour and density correction • „Hold“ key for holding set corrections • entry of lens aperture • switching the enlarger light on and off • automatically slots out the pre-filtration • making the exposure

AC 800 Control

BW test negative (24 x 36 mm) for focus calibration (AC 800 AF)

Test 35

Plastic protective cover

Autocuf

Spare parts Standard film carrier with a top Bimagla AN glass

Cobineg

Glass for Cobineg film carrier with antiNewton ring coating

Bimagla AN

Metal mask pair for the glassless enlargement of 6 x 7 cm films in Cobineg film carriers

Binema 67

Light box for film sizes up to 6 x 9 cm

AC 800 Box 69

Specially selected halogen lamp 250 W/ 24 V

Colamp 250

BW test negatives (6 x 9 cm) for focus calibration

Test 69

Colamp 250

Durst AC 800/AF-03/96

10.0 Special accessories

EU-Conformity declaration

We,

Durst Phototechnik AG Postfach 223 Vittorio-Veneto-StraĂ&#x;e 59 I-39042 Brixen

declare, that the apparatus named hereafter complies with the applicable EU Safety and Health Guidelines. This declaration is void, if any alterations to the apparatus have been implemented prior to our consent.

Nature of the apparatus:

Enlarger

Type:

Durst AC 800/AF

Applicable EU Guidelines:

EU machine guideline (89/392/EEC) version 93/44/EEC EU low-voltage guideline (73/23/EEC) EU guideline for electro-magnetic compatibility (89/336/EEC) version 93/31/EEC

Applied Standard in particular:

DIN EN292-1: 11.1991, DIN EN292-2: 11.1991, DIN EN294: 08.1992, DIN EN349:06.1993, EN 60950, EN 55022, EN 50082-1, EN 55024-2, EN 55024-3, EN 55024-4

Date:

Brixen, December 1995

Manufacturerâ&#x20AC;&#x2122;s signature: Title of Signer:

Dr. Richard Piock Managing Director

Durst AC 800/AF-03/96

Improvements

Durst AC 800/AF-03/96

Improvements

Durst AC 800/AF-03/96

Durst Phototechnik AG Division Phototechnik Vittorio-Veneto-StraĂ&#x;e 59 I-39042 Brixen, Italy Telefon +39/0472 810111 Telefax +39/0472 83 09 80 www.durst-online.com E-Mail:info@durst.it

IV60045