Difference between revisions of "CdS"
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| − | '''CdS''' | + | '''CdS''' — Cadmium Sulphide: in photographic terms, this refers to an electronic [[light meter]] using a CdS light-dependent resistor as a sensor. These became common in the early 1970s, largely replacing the less sensitive [[Selenium]] meters. Unlike Selenium, which was powered by light, these meters required a battery, and were sufficiently power-hungry that the meter needed to be switched on for as short a time as possible. Thus CdS meters need some sort of switch, where Selenium meters were just left to run all the time. |
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[[Category: stub]] | [[Category: stub]] | ||
Revision as of 00:41, 14 January 2009
CdS — Cadmium Sulphide: in photographic terms, this refers to an electronic light meter using a CdS light-dependent resistor as a sensor. These became common in the early 1970s, largely replacing the less sensitive Selenium meters. Unlike Selenium, which was powered by light, these meters required a battery, and were sufficiently power-hungry that the meter needed to be switched on for as short a time as possible. Thus CdS meters need some sort of switch, where Selenium meters were just left to run all the time.
Glossary Terms
