Photo-electric cell

Photo-electric cell.
A metering cell that converts light into a small charge that was used in older, non-battery meters or cameras to measure exposure.
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Photo-electric cell.
Techniques Glossary Photo-electric cell.
A metering cell that converts light into a small charge that was used in older, non-battery meters or cameras to measure exposure.

Photo-electric cell - light sensitive cell. Two types are used in exposure meters. A selenium cell generates electricity in proportion to the amount of light falling upon its surface.

Slave
A photo-electric cell which fires additional flash units simultaneously when it is activated by the light from another flash source set by the camera.

-Slave unit - mechanism which fires other flash sources simultaneously when a photo-electric cell is activated by the illumination emitted by a camera linked flash.
-Slide - alternative term for a projection transparency.

See also: Camera, Exposure, Meter, Light, Focus