Patent
1993-08-26
1995-11-28
Gray, David M.
G03B 1310
Patent
active
054712718
ABSTRACT:
A real image mode variable magnification finder optical system includes an objective system having a positive refracting power and an eyepiece system having a positive refracting power. The objective system includes a first lens unit (a front optical unit) having at least one lens, an intermediate lens unit having at least one lens unit moving along the optical path, and a rear optical unit having a plurality of reflecting surfaces. By replacing the first lens unit with a lens unit of different focal length, the magnification of the finder optical system is changed.
REFERENCES:
patent: 4751539 (1988-06-01), Yamada et al.
Gray David M.
Olympus Optical Co,. Ltd.
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