LEICA SUPER ELMAR-M 1:3,4/21mm ASPH.
With the LEICA SUPER-ELMAR 21 mm f/3.4 ASPH., Leica is extending the range of M lenses in the super wide angle range with a model that combines outstanding reproduction with a compact design. It delivers uniformly excellent reproduction quality over the entire field of view, with only a very slight deterioration at the edges in the close-up range. This performance can only be improved slightly by stopping down, which means that you can take photographs with full stop with no concerns, unless your compositional ideas call for a greater extension of the depth of field that can only be achieved with smaller apertures. The vignetting characteristic of every optical system is more pronounced on a super wide-angle lens than on normal lenses and those with long focal lengths. At full stop in 35mm format it is a maximum, i.e. in the corners of the image, of around 2,1 stops, around 1,2 stops on Leica M8 models with their slightly smaller format. Stopping down to f/5.6 reduces this light falloff at the edge of the image – to 1.6 and 1.0 stops respectively. Stopping down further does not result in any further reduction as essentially only the natural vignetting remains. The maximum distortion of the lens of around 1.5 % is hardly perceptible. The retrofocus-like construction is made up of a total of eight lens elements, and the use of a lens element with two aspherical surfaces and four lens elements made of glass types with anomalous color dispersion (partial dispersion) make a crucial contribution towards restricting aberrations to an absolute minimum. Summary: The LEICA SUPER-ELMAR-M 21 mm f/3.4 ASPH. combines optimum reproduction with compact dimensions, offering all M users a wide range of options in the spontaneous super wide-angle photography that is typical of the Leica M.
Lens shape
ASPH.
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LEICA SUPER ELMAR-M 1:3,4/21mm ASPH.
Engineering drawing
Technical Data Angle of view (diagonal, horizontal, vertical)
Optical design
for 35mm (24x36mm): 91°, 80°, 59° for M8 (18x27mm): 74°, 64°, 46° (Equivalent focal lenght : approx. 28mm) Number of lenses/groups: 8 / 7
Aspherical surface: 2
Position of entrance pupil: 15,6mm (related to the first lens surface in light direction)
Distance setting
Focus range: 0,7m - ∞
Scales: Combined meter/feet graduation
Smallest object field: 706 mm x 1059 mm (35mm) / 530 mm x 795 mm (for M8) Largest reproduction ratio: 1:29,4
Aperture Setting/Function: With click-stops, half values available, manual diaphragm
Lowest value: 16
Bayonet Leica M quick-change bayonet with 6 bit lens identification bar code for digital M models Filter mount/Lens hood
Non-rotating
Female thread for screw-on filters size E46
Male thread with stop for lens hood (included in delivery) Dimension and weight
Length: ca. 43/55mm (with/without Lens hood) Largest diameter: approx. 53mm
Weight: approx. 279g
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Aperture Stop 3.4
[%] 100
[%] 100
LEICA Aperture SUPER ELMAR-M 1:3,4/21mm ASPH. 80 Stop 3.4 Vignetting
[%] 100
60
60 80
8.0 5.6 3.4
80 40
60
40
60 20
20 MTF-graphs 40
40
0
0
0 20
5
20
0 [%] 0 100
5
80
Aperture Stop 3.4 15 10
20 Y'[mm]
80 40 60 20 40 0 0 20 0 [%] 100 0
5
5
80
10
15
Aperture Stop 5.6 15 10
20 Y'[mm]
20 Y' [mm]
Aperture Stop 8.0
[%] 100 60 80 40 60 20 40 0 0
0 [%] 100 0
5
5
10
15
Aperture Stop 8.0 15 10
0 [%] 100 0 80
Aperture Stop 5.6
[%] 100 60
20
3
80
[%] 100
20 Y' [mm]
15
8.0 5.6 3.4
0
3
Y'[mm]
saggital structures Effective Distortion 9 structures 6 sagittal 12 15 18 X'[mm]
12 9
40
6
20
3 0
0 0
5
10
15
20 Y'[mm]
5 4 3 2 1 0 -1 -2 -3 -4 -5
5
[%]
[%] 5 60 60 4 3 40 40 2 1 20 20 0 -1 0 0 -2 5 15 0 10 20 5 5 15 0 10 20 0 -3 Y'[mm] Y' [mm] -4 Relative Distortion Aperture Stop 8.0 E -5 [%] [%] 5 15 10 20 50 100 Y'[mm] 4 Y'[mm] 3 80 MTF The is indicated at full aperture, at aperture f/5,6 Effective Distortion 12 and at aperture f/8,0 at long taking distances (infini2 ty). Shown is the contrast in percentage for 5, 10, 20 1 60 Y'[mm] and 40 lp/mm accross the height of the 35 mm film 9 0 format, for tangential (dotted line) and sagittal (solid -1 40 structures, in white light. The 5 and 10 lp/mm will 12 line) 6 -2 give an indication regarding the contrast ratio for large 9 -3 20 structures.The 20 and 40 lp/mm records the 3 object resolution of finer and finest object structures. -4 6 -5 0 0 5 15 0 10 20 5 15 0 3 0 10 20 3 Y'[mm] Y'[mm]
80 60
0
20 Y'[mm]
Aperture Stop 5.6 Vignetting 15 10 20 Y'[mm]
[%] 100 5
80 Relative Distortion
0 20 Y'[mm]
10
0
3
6
9
12
15
18 X'[mm]
4
15
80
20 Y'[mm]
8.0
60
40
40
20
20
0
0 5 0
0 Distortion
5 4 3 2 1 0 -1 -2 -3 -4 -5 20 Y' [mm]
15 10
20 15 Y'[mm]
20 Y' [mm]
5
0
4
15
10
20 Y'[mm]
Effective Distortion Y'[mm]
80 12 60
9
40
6
20 0 5 0
0
3 0 10 5
15 10
20 15 Y'[mm]
20 Y'[mm]
0
3
6
9
12
15
18 X'[mm]
Effective Distortion Y'[mm] 12 Vignetting
9 6
4
15
10 5
Aperture Stop 8.0 Relative Distortion [%] 100
[%]
0
15
5 4 3 2 1 0 -1 -2 -3 -4 -5
Relative Distortion
[%]
LEICA80 SUPER ELMAR-M5.6 1:3,4/21mm ASPH. 3.4
60
6
15
[%]VignettingAperture Stop 5.6 100
[%] 100
Vignetting
3 [%] 100 20 Y'[mm]
0 80 0
3
6
9
15
12
18 X'[mm]
60 40 20 0 0
20 Y'[mm]
6 5 4 3 2 1 0 -1
[%]
5
10
15
Relative Distortion
20 Y'[mm]
8.0 5.6 3.4
Distortion is the deviation of the real image height (in the picture) from the ideal image height. The relative distortion is the percentage deviation. The ideal image height results from the object height and the magnification. The image height of 21.6mm is the radial distance between the edge and the middle of the image field for the format 24mm x 36mm. The graph of the effective distortion illustrates the appearance of straight horizontal and vertical lines in the picture. Vignetting is a continous decrease of the illumination to the edges of the image field. The graph shows the percentage lost of illumination over the image height. 100% means no vignetting.
LEICA SUPER ELMAR-M 1:3,4/21mm ASPH.
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Depth of field table Magnification
4.0
5.6
8.0
11.0
16.0
0.7
0.612 0.821
0.599 0.848
0.567 0.928
0.525 1.083
0.481 1.377
0.425 2.578
1/29.4
0.8
0.685 0.967
0.668 1.004
0.628 1.121
0.576 1.362
0.523 1.878
0.455 5.359
1/34.1
1
0.822 1.285
0.797 1.355
0.739 1.584
0.666 2.134
0.595 3.830
0.507
∞
1/43.5
1.2
0.949 1.647
0.915 1.765
0.838 2.186
0.744 3.429
0.655 12.51
0.548
∞
1/52.8
1.5
1.122 2.294
1.075 2.533
0.967 3.526
0.843 8.732
0.728
∞
0.596
∞
1/66.8
2
1.372 3.774
1.301 4.486
1.144 9.113
0.971
∞
0.819
∞
0.654
∞
1/90.2
3
1.765 10.64
1.647 19.57
1.400
∞
1.146
∞
0.937
∞
0.724
∞
1/136.9
5
2.290
∞
2.093
∞
1.705
∞
1.338
∞
1.059
∞
0.792
∞
1/230.3
∞
4.136
∞
3.524
∞
2.532
∞
1.789
∞
1.316
∞
0.921
∞
1/∞
DistanceSetting[m] DistanceSetting[m]
ApertureStop3.4 ApertureStop3.4 0,7 0,7 0,8 0,8 1 1 1,2 1,2 1,5 1,5 2 2 3 3 5 5 ∞ ∞ 0 0
1 1
2 2
3 3
4 4
5 6 7 5 DepthofField[m] 6 7 DepthofField[m]
8 8
9 9
10 10
11 11
12 12
ApertureStop4.0 ApertureStop4.0
DistanceSetting[m] DistanceSetting[m]
DistanceSetting[m]
ApertureStop 3.4
0,7 0,7 0,8 0,8 1 1 1,2 1,2 1,5 1,5 2 2 3 3 5 5 ∞ ∞ 0 0
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 10 11 9 10 11 DepthofField[m] DepthofField[m]
12 12
13 13
14 14
15 15
16 16
17 17
18 18
19 19
20 20
LEICA SUPER ELMAR-M 1:3,4/21mm ASPH.
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ApertureStop5.6
0,7
DistanceSetting[m]
0,8 1 1,2 1,5 2 3 5 ∞
0
1
2
3
4
5
6
7
8
9
10
11
12
DepthofField[m]
ApertureStop8.0
0,7
DistanceSetting[m]
0,8 1 1,2 1,5 2 3 5 ∞
0
1
2
3
4
5 DepthofField[m]
6
7
8
9
10
LEICA SUPER ELMAR-M 1:3,4/21mm ASPH.
7
ApertureStop11.0
0,7
DistanceSetting[m]
0,8 1 1,2 1,5 2 3 5 ∞
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
DepthofField[m]
ApertureStop16.0
0,7
DistanceSetting[m]
0,8 1 1,2 1,5 2 3 5 ∞
0
1
2
3
4
5
6
7
DepthofField[m]
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