Real image mode variable magnification finder optical system

Details Real image mode variable magnification finder optical system Real image mode variable magnification finder optical system

1991-06-20

1992-09-01

Gellner, Michael L.

G03B 1312

Patent

active

051443490

ABSTRACT:
The real image mode variable magnification finder optical system comprises an objective which consists of a first lens component having a negative refractive power, a second lens component having a positive refractive power and a third lens component having a positive refractive power, and an eyepiece having a positive refractive power. For variation of magnification and correction of diopter, the second lens component and the third lens component are moved, while the first lens component is kept stationary, so as to set the airspace reserved therebetween at a maximum width thereof in the vicinity of a middle field angle. This finder optical system has a variable magnification ratio which is substantially higher than 2, can correct aberration favorably, permits shortening total length of the finder section thereof and can be manufactured at a low cost.

REFERENCES:
patent: 4842395 (1989-06-01), Sato et al.
patent: 4906078 (1990-03-01), Inabata et al.
patent: 4992809 (1991-02-01), Nozaki et al.
patent: 5014078 (1991-05-01), Kudo et al.

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