Combination focussing screen and film holder attachment

Details Combination focussing screen and film holder attachment Combination focussing screen and film holder attachment

1977-12-30

1979-04-17

Gonzales, John

G03B 1744

Patent

active

041497910

ABSTRACT:
An attachment for a photographic camera for alternately maintaining a focussing screen and a film holder in an operative position with respect to a camera. The attachment is provided with a focussing screen rendered movable by connection to a rotatable shaft between operative and operative positions to permit placement of the film holder when the screen is in its inoperative position. Locking means actuated by the rotatable shaft are provided to lock the focussing screen or the film holder in operative positions. Also, means operated by rotation of the shaft are provided to control the condition of the camera shutter.

REFERENCES:
patent: 493365 (1893-03-01), Low et al.
patent: 2549670 (1951-04-01), Dalton
patent: 3786735 (1974-01-01), Seiden
patent: 3896464 (1975-07-01), Galvin

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