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Abstract
Photographic emulsions suffer from reciprocity law failure (RLF) under conditions of both high intensity, short duration exposures and low intensity, long duration exposures. In astronomical photography the latter condition is regularly met, and hypersensitization methods are applied by the user to emulsions before exposure in order to reduce the effects of low intensity RLF.
In this paper, the available methods of hypersensitization are reviewed, and the most recently reported conditions for optimum hypersensitization are presented.
Notes
Paper presented at a symposium on “Photography in Astronomy” organized by The Royal Photographic Society on 8 December J975 in London. MS received 12 March 1976.