Viewfinder system for a large camera

Details Viewfinder system for a large camera Viewfinder system for a large camera

1976-07-23

1978-03-28

Griffin, Donald A.

354219, G03B 1302

Patent

active

040818098

ABSTRACT:
Large camera viewfinder system in which an eyepiece is positioned at an upper rear portion of the camera, to permit eye-level viewing and free adjustment of camera attitude and a viewfinder objective lens assembly which has the same focal length as and is movable equivalent amounts simultaneously with a movable front lens assembly of a taking lens assembly, is positioned level with and a short distance from the taking lens assembly, the viewfinder objective lens assembly and eyepiece being on opposite sides of the optical axis of the taking lens assembly, and light being transmitted therebetween by an optical system inside the camera. With the viewfinder objective lens assembly being close to the taking lens assembly but a comparatively long distance from the viewfinder eyepiece problems of parallax are minimum and image erection can be effected by a simple lens means, a heavy and expensive prism such as a roof-angle prism being unnecessary.

REFERENCES:
patent: 2219314 (1940-10-01), Hoch
patent: 2909109 (1959-10-01), Back
patent: 2949833 (1960-08-01), Steineck
patent: 3791274 (1974-02-01), Hansen

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