Close-up device for photographic viewfinder cameras

Details Close-up device for photographic viewfinder cameras Close-up device for photographic viewfinder cameras

1978-09-07

1980-08-26

Hix, L. T.

354295, G03B 1100, G03B 1318

Patent

active

042192641

ABSTRACT:
Disclosed is an interchangeable attachment for photographic viewfinder cameras for increasing the close-up focusing power thereof. This device comprises a supplementary lens optically aligned with the camera objective lens; a parallax correction prism optically aligned with the camera viewfinder; a common view rangefinder system; and a support member for carrying the optically active elements of the device, adapted to be mounted on the camera in front of the camera objective lens. In order to compensate for the change in object distance resulting from the attachment of the device to the camera, the parallax correction prism and the rangefinder system have their optical powers adjusted to correspond to this change, enabling one to directly see through the viewfinder whether the object is in focus and to permit simultaneous correction of the parallax through the viewfinder.

REFERENCES:
patent: 2526522 (1950-10-01), Wallendorf
patent: 2674932 (1954-04-01), Tydings et al.
patent: 2944475 (1960-07-01), Goldberg
patent: 2953981 (1960-09-01), Leitz
patent: 3253528 (1966-05-01), Bing
patent: 3836934 (1974-09-01), Suzuki et al.

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