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The Epic Interactive Encyclopedia 1998
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Epic Interactive Encyclopedia, The - 1998 Edition (1998)(Epic Marketing).iso
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Exposure_meter
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1992-09-02
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481b
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12 lines
Instrument used in photography for indicating
the correct exposure - the length of time the
camera shutter should be open under given
light conditions. Meters use substances such
as cadmium sulphide and selenium as light
sensors. These materials change electrically
when light strikes them, the change being
proportional to the intensity of the incident
light. Many cameras have a built-in exposure
meter that sets the camera controls
automatically as the light conditions change.