Viewfinder mask orienting device in a camera

Details Viewfinder mask orienting device in a camera Viewfinder mask orienting device in a camera

1979-10-02

1981-02-17

Griffin, Donald A.

G03B 1310

Patent

active

042511496

ABSTRACT:
In the viewfinder optical system of a reflex camera with a film holder which is rotatable to change the orientation of the oblong image on its film, a viewfinder mask orienting device supporting a square focusing screen has two pairs of rotatable masking blades, the two blades of each pair being integrally joined in Vee shape, which are actuated by the rotation of the film holder to operate cooperatively to alternately mask edge parts of the two pairs of opposed sides of the focusing screen thereby to form an oblong viewfinder image and change the orientation of this image to conform to that of the image on the film.

REFERENCES:
patent: 1991924 (1935-02-01), Dolan
patent: 2295801 (1942-09-01), Nagel
patent: 2719468 (1955-10-01), Steiner

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