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Abstract
During the past ten years, the applications of microimages have been extended from mere security records to records in active use. As a result, it is desirable to use the highest-quality microimage system that is available. It has become necessary, therefore, to acquire a better understanding of the factors which control this quality. The purpose of this paper is to discuss the manner in which the nature of the original, the properties of the lens and the properties of the film influence the quality of the image. The application of the concept of modulation transfer function to the study is discussed.