Keplerian zoom finder optical system

Details Keplerian zoom finder optical system Keplerian zoom finder optical system

1994-10-26

1997-07-08

Nguyen, Thong

Optical: systems and elements

Compound lens system

Telescope

359432, 359689, 396378, 396379, G02B 2314, G03B 1308

Patent

active

056467770

ABSTRACT:
A Keplerian zoom finder optical system has an objective lens comprising, in succession from the object side, a first lens unit of negative refractive power, a second lens unit of positive refractive power, and a third lens unit of positive refractive power and having positive refractive power as a whole, and an eyepiece of positive refractive power for enlarging and observing the focused image of the objective lens therethrough. The air gap between the first lens unit and the second lens unit is varied to thereby vary finder magnification.

REFERENCES:
patent: 4526444 (1985-07-01), Fantone et al.
patent: 4715692 (1987-12-01), Yamada et al.
patent: 4779969 (1988-10-01), Sato et al.
patent: 4906078 (1990-03-01), Inabata et al.
patent: 4972216 (1990-11-01), Ueda et al.
patent: 5052787 (1991-10-01), Sugawara
patent: 5054897 (1991-10-01), Ozawa
patent: 5257055 (1993-10-01), Cho et al.
patent: 5381265 (1995-01-01), Ohshita

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