Photographs were made using several photographic systems, all having entrance pupils of the same diameter. Each of five lenses, varying in focal length from to 33 in., was used with five different kinds of photographic film. The lenses were the best that could be obtained for the purpose of this experiment. The films varied from a fast aerial film to a fine-grain film designed for document reproduction, but all were developed to a gamma of approximately 1.5. The test object was a transparency of a farm scene. An enlarged positive transparency was made from each negative to such a scale that the image of the scene had the same size in each one. It was found that the films of moderate and high speed recorded practically the same amount of detail for a given exposure time but that the document-copying films recorded much less.
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