Patent
1982-02-01
1983-07-12
Mathews, Alan
354 83, 354276, G03B 1726
Patent
active
043927319
ABSTRACT:
A film cartridge assembly is adapted to be received in cameras, and contains film which may or may not match the camera's exposure characteristics. A filter is carried by the cartridge to compensate for the exposure characteristics of cameras not matched to the film's photographic characteristic. The filter is selectively removable from the optical path of cameras having exposure characteristics matching that of the film, and automatic means are provided to effect such removal. In a preferred embodiment, cartridge assemblies including instant film units of a predetermined speed are provided with a neutral density filter at the exposure aperture. When inserted into a camera adapted for properly exposing such film units, the neutral density filter is removed by action of the camera before the first exposure is made. Cameras adapted to properly expose only film of slower speed do not effect removal of the filter, and the amount of light reaching the film during exposure is reduced by the presence of the filter in the exposure aperture.
REFERENCES:
patent: 3631773 (1972-01-01), Moodie
patent: 3696716 (1972-10-01), Pasieka
patent: 3800311 (1974-03-01), Olsson
patent: 3916423 (1975-10-01), Ueda et al.
patent: 3993488 (1976-11-01), Oishi
patent: 4149790 (1979-04-01), Smith
Eastman Kodak Company
Mathews Alan
Sales Milton S.
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