Term - Photo electric cell

Photo electric cell

SWPP and BPPA Photographic Glossary

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Photo electric cell

The 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. A cadmium sulfide cell offers a resistance to a small electric charge when light falls upon it. Cadmium sulfide cells are more sensitive then selenium, especially at low light levels.

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