Differential viewfinder masks

Details Differential viewfinder masks Differential viewfinder masks

1996-06-06

1997-11-18

Gellner, Michael L.

Photography

With data recording

Optical

396378, 396380, G03B 1724, G03B 1702, G03B 1302

Patent

active

056897430

ABSTRACT:
A camera comprising a viewfinder for defining a field of view provided with a given aspect ratio, and a pair of front and rear masks insertable in the field of view to position respective larger and smaller openings of the front and rear masks in the field of view to change the aspect ratio of the field of view, is characterized in that a differential gear mechanism connects the front and rear masks for moving the front mask a greater extent than the rear mask is moved, to position the larger and smaller openings in the field of view.

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