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A single slide, showing a color transparency in a plastic frame Slide projector, showing the lens and a typical double slide carrier. In photography, reversal film or slide film is a type of photographic film that produces a positive image on a transparent base. [1]
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AP Images; Bridgeman Art Library: California Digital Library: California State University, Northridge, Oviatt Library Digital Collections Camera Press: Chicago Daily News (1902–1933), collection of over 55,000 images on glass plate negatives Corbis Images: Depositphotos: Stock Images: 164,000,000+ (June 2020) Yes No Yes English (Default)+ 21 ...
The conservation and restoration of photographs is the study of the physical care and treatment of photographic materials. It covers both efforts undertaken by photograph conservators, librarians, archivists, and museum curators who manage photograph collections at a variety of cultural heritage institutions, as well as steps taken to preserve collections of personal and family photographs.
Reversal film created a small positive projectable image rather than the negatives used since the early days of photography; photography now produced 35mm directly viewable small colour slides, rather than large monochrome negatives. The slide images were too small for unaided viewing, and required enlargement by a projector or enlarging viewer.
Agfacolor Neu (English: New Agfacolor) color reversal film for home movies and slides. 1939 Agfacolor negative and positive 35 mm color film stock for professional motion picture use (not for making paper prints). The View-Master 3-D viewer and its "reels" of seven small stereoscopic image pairs on Kodachrome film are introduced.
Therefore, the transparency is placed face up (toward the mirror and focusing lens), in contrast with a 35mm slide projector or film projector (which lack such a mirror) where the slide's image is non-reversed on the side opposite the focusing lens. A related invention for enlarging transparent images is the solar camera.
1927: A London schoolteacher instructs his students not to view the sun with the naked eye but to use instead two dense photographic negatives sandwiched together to protect their eyes.
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