A means of producing photographic edges using visible radiation is often a requirement for evaluating some of the image characteristics of a photographic emulsion. The method of producing edges described uses a high quality razor blade for the knife edge held at a small angle to the film plane. The instrument is detailed and elaborates on the major features of the constructed apparatus. These features are a vacuum surface to insure film flattness; the knife edge held by a jaw-clamp assembly that pivots to allow for contrast control of the image; and exposure through a tungston-halogen lamp and an electronic shutter which has a separate timer.

Library of Congress Subject Headings

Images, Photographic; Photography--Equipment and supplies--Design and construction

Publication Date


Document Type


Department, Program, or Center

School of Photographic Arts and Sciences (CIAS)


Not Listed


Note: imported from RIT’s Digital Media Library running on DSpace to RIT Scholar Works. Physical copy available through RIT's The Wallace Library at: TR222 B46


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