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
Department, Program, or Center
School of Photographic Arts and Sciences (CIAS)
Benson, Michael, "Design and Construction of an Edge Exposure Apparatus" (1976). Thesis. Rochester Institute of Technology. Accessed from
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