Photographic camera with automatically controlled filter

Details Photographic camera with automatically controlled filter Photographic camera with automatically controlled filter

1975-05-19

1976-11-30

Peters, Jr., Joseph F.

Optics: motion pictures

Removable film strip magazine type

352141, 354 36, 354202, G03B 700, G03B 710, G03B 1100

Patent

active

039952851

ABSTRACT:
An optical filter the density of which is variable is provided in the optical path of the taking lens. The density of the filter is controlled to effect optimum exposure with freely selected aperture size and the shutter speed by means of an exposure control circuit. The density of the filter is varied by moving a filter operating member. The filter operating member is controlled by the output of an electric circuit connected with a light measuring circuit including a photodetector to measure the scene brightness.

REFERENCES:
patent: 3209667 (1965-10-01), Coutant
patent: 3538335 (1970-11-01), Tartanion
patent: 3732793 (1973-05-01), Tague

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