reciprocity failure(redirected from Reciprocity (photography))
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reciprocity failure(res-ă-pross -ă-tee) See photographic emulsion.
reciprocity failure[‚res·ə′präs·əd·ē ‚fāl·yər]
A phenomenon wherein the usual combination of light intensity and exposure time (following the reciprocity law) required to produce a specified density in a photographic emulsion changes due to especially long exposure time or low light intensity.