18th Renwick Memorial Lecture: The Efficiency of the Photographic Process

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Abstract
The significance of attempts to use Detective Quantum Efficiency as a performance rating for materials used in astronomical photography is questioned and it is shown that a material of high efficiency will not necessarily be the best with which to detect a faint star. However, there is one little used system, in which the information from a number of identical negatives is combined, and for which detectivity increases continuously with total exposure at a rate determined by the efficiency of the material and thus causes the photographic system to be directly comparable with photoelectric systems now widely used to measure the brightness of a star once its location has been determined photographically.

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