Abstract

Three types of emulsion were studied for resolving power as a function of development time, and one type was studied with six developers. In all cases the relation described in the recent literature was confirmed, namely, a rapid rise to a maximum, followed by a slight drop to an approximately constant value. An inverse logarithmic relation between exposure and the development time required to give maximum resolving power was found to hold for a moderate range of development times, but the constant of proportionality varied with the photographic material. When the materials were developed to the customary fractions of their gamma-infinities, however, the exposure required for best resolution was practically independent of development time. Except for a certain thiocyanate developer, all the developers studied gave substantially the same resolving power for practical gammas. At extremely low gammas, the resolving power was about 20 percent higher than for practical gammas except in the cases of the borax and the thiocyanate developers, for which the values were about 40 percent higher. The drop in resolving power with increase in gamma was slowest for the thiocyanate developer, but at the highest gammas attainable with this developer the resolving power was the same as for the others.

© 1952 Optical Society of America

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