Exposure Compensation O
ne of the most important functions on your camera is the exposure compensation feature. When the built-in meter doesn’t provide the perfect exposure, exposure compensation allows you to adjust the image lighter and darker in 1/3 f/stop increments. Many beginning photographers assume incorrectly that you can alter exposure by adjusting the lens aperture and shutter speed. This is true only when the camera is set to manual exposure mode.
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When the camera is set to an automatic exposure mode -- Program, Aperture priority, Shutter priority -- changing the lens aperture or shutter speed does not change the exposure. The reason is simple. The lens aperture and
