Finder optical system

Details Finder optical system Finder optical system

1999-08-16

2000-10-31

Perkey, W. B.

Photography

With viewfinder

Selective or adjustable viewfinder field

G03B 1310

Patent

active

061415049

ABSTRACT:
In a SLR camera having a diopter adjusting lens element movable along the optical axis, the movement of which causes a change in the apparent visual angle, there is provided a finder optical system including a field frame size varying mechanism for varying the size of the opening of the field frame, and an association mechanism for driving the field frame size varying mechanism so that the change in the apparent visual angle of the finder optical system is compensated when the diopter is varied by moving the diopter adjusting lens element.

REFERENCES:
patent: 4389097 (1983-06-01), Ohishi
patent: 5136427 (1992-08-01), Sugawara
patent: 5790908 (1998-08-01), Matsuda
patent: 6006038 (1999-12-01), Kosako

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