AUTOMATIC EXPOSURE METER
[Film Technology]
Most amateur cameras have a built in exposure meter which automatically adjusts the aperture and controls the amount of light reaching the film. It is simple to use, the operator merely sets the exposure rating on the camera at the subject. The amount of light reflected [reflection] from the scene actuates the light cell, which in turn opens or close the lens aperture. The process is virtually instantaneous and continuous. So that while the film is being exposed, if the camera pans to a darker area or the sun suddenly appears, an automatic adjustment is made.
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