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A comprehensive alphabetical list of photographic terms and meanings.
Quantum:- smallest indivisible unit of radiant energy.
Quarterplate:- negative or print format measuring 3 ¼ x 4 ¼ inches. It's one quarter the size of a full plate (8 ½ x 6 ½ inches).
Quartz-iodine lamp:- compact tungsten filament lamp designed to maintain its color temperature and light intensity throughout its working life.