Variable magnification finder optical system

Details Variable magnification finder optical system Variable magnification finder optical system

1993-07-09

1995-02-21

Blankenship, Howard B.

354159, 35419512, G03B 1310, G03B 1702, G03B 500

Patent

active

053920848

ABSTRACT:
A variable magnification finder optical system is constructed independent of a photographic optical system, and includes an objective optical system of positive refracting power, a field frame, and an eyepiece optical system of positive refracting power. The objective optical system has a variable magnification lens unit for changing the field angle of the variable magnification finder optical system in accordance with a change of the field angle of the photographic optical system and a fixed lens unit, which can be replaced with another fixed lens unit for changing over the finder magnification. Thus, this finder optical system allows the photography of an object with a field image, easy for observation, coordinated with that of the photographic optical system.

REFERENCES:
patent: 4652104 (1987-03-01), Harvey
patent: 4973997 (1990-11-01), Harvey
patent: 5012262 (1991-04-01), Mogamiya et al.
patent: 5021815 (1991-06-01), Harvey
patent: 5144349 (1992-09-01), Kato et al.
patent: 5231534 (1993-07-01), Kato
Photographic Industries, Nov. 1991, pp. 36 & 37, vol. 49, No. 11, Shashin Kogyo Publishing Co., Ltd.

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