Variable magnification viewfinder

Details Variable magnification viewfinder Variable magnification viewfinder

1995-08-10

1998-06-30

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

057742758

ABSTRACT:
A variable magnification viewfinder is disclosed, comprising, from front to rear, at least a first lens unit of positive refractive power, a second lens unit of negative refractive power, a third lens unit, a fourth lens unit of positive refractive power and a fifth lens unit, wherein zooming is performed by varying air separations between every successive two of the lens units.

REFERENCES:
patent: 4832471 (1989-05-01), Hamano
patent: 4934796 (1990-06-01), Sugiura et al.
patent: 4988174 (1991-01-01), Horiuchi et al.
patent: 5009492 (1991-04-01), Hamano
patent: 5050972 (1991-09-01), Mukaiya et al.
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5138492 (1992-08-01), Hamano et al.
patent: 5299064 (1994-03-01), Hamano et al.
patent: 5430576 (1995-07-01), Hamano
patent: 5448400 (1995-09-01), Kikuchi et al.

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