Relationships between Optimal Exposure Characteristics of Photographic Materials

Abstract

With very few exceptions the optimal exposure time of a commercial material increases as the reference density is increased. The optimal exposure time also increases as the sensitivity decreases (in terms of incident exposure). The change is such that optimal intensity is very roughly constant in both cases. The above findings show first that the rate of absorption giving maximum efficiency is largely independent of sensitivity among the grains of a single emulsion, and second that the rate of absorption of quanta/unit volume of silver halide giving maximum efficiency is independent of grain size.