Variable magnification finder

Details Variable magnification finder Variable magnification finder

1995-07-19

1996-09-10

Gellner, Michael L.

Optical: systems and elements

Prism

With reflecting surface

359676, G03B 1310, G02B 1514

Patent

active

055554318

ABSTRACT:
A variable magnification finder has an objective lens group having an overall positive power. A first lens group and a second lens group each have a negative refractive power; a third lens group and a fourth lens group each have a positive refractive power; and an eyepiece lens group has a positive power. The second and third lens groups move to zooming from the wide angle position to the telephoto position, and compensate the change of an aberration resulting from such movement of the second and third lens groups.

REFERENCES:
patent: 4842395 (1995-06-01), Sato et al.
patent: 5144349 (1992-09-01), Kato et al.
patent: 5232264 (1994-06-01), Kato
patent: 5247324 (1993-09-01), Estelle
patent: 5448411 (1995-09-01), Morooka

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