Abstract

The application of a quantum theory of photographic exposure to photographic films of extended exposure latitude is studied, and it is shown that the density-log exposure data of such materials are incapable of representation by equations based on the simple theory. The applicability of binary functions, as well as functions based on variable intrinsic sensitivity (ϵ) or quantic sensitivity (γ) of the emulsions, is examined for a number of exemplary films, including some experiments on the effects of supersensitizing-optical sensitizing combinations.

© 1952 Optical Society of America

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Figures (16)

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