Patent
1980-09-03
1983-05-24
Gonzales, John
354203, G03B 150
Patent
active
043847749
ABSTRACT:
Means and a method are disclosed by which a conventional camera can be converted from its usual full-frame format to a half-frame format. The conversion means comprises a mask removably locatable within the camera body directly forward (i.e. facing the lens rear surface) of the film in the camera, and having a window therein centrally located with respect to that aperture in the camera body defining the full-frame image format. The mask window is properly sized to provide a half-frame image format, effecting a 50% reduction in the exposed image area, by blocking quarter frame areas of the camera body aperture at either end thereof. The mask is preferably bowed rearwardly against the film's emulsion surface, so as to bias the film against the camera pressure plate. The conversion means may also include means to apply indicia to a film leader, cooperating with indicia applied to the inside of the camera body, to assure proper indexing of the film through the camera; means to apply a half-frame reticle to the focusing screen of a view finder assembly; and audible or physical means to assist in preventing complete rewind of the film leader into the film cassette. The mask, or the mask and some or all of the above identified elements, may be packaged as a conversion kit.
In use, the mask is mounted in the camera and a roll of film is loaded, having been properly indexed with respect to the camera sprocket. The film is then advanced in a first pass through the camera, exposing a first set of half-frame image areas on the film, with unexposed half-frame areas located therebetween. The film is thereafter rewound and reloaded, again properly indexed with respect to the camera sprocket, and advanced in a second pass through the camera, exposing a second set of half-frame image areas constituting those alternate unexposed areas.
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patent: 3868703 (1975-02-01), Ueda
patent: 3899791 (1975-08-01), Kerr
patent: 4034393 (1977-07-01), Goldmacher
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