Zoom lens system

Details Zoom lens system Zoom lens system

1985-03-04

1986-12-16

Corbin, John K.

G02B 1514

Patent

active

046292934

ABSTRACT:
A high performance zoom lens system having a very large aperture ratio and a long back focal distance comprising a first lens group having a focusing function and positive power, a second lens group movable along the optical axis, and having a function mainly for varying focal length of said zoom lens system as a whole and negative power, a third lens group movable along the optical axis, and having a function mainly for correcting the image position and negative power, and a fourth relay lens group, said fourth lens group consisting of a front subgroup comprising three positive lens components and a negative lens component, and a rear subgroup comprising two positive lens components.

REFERENCES:
patent: 4518228 (1985-05-01), Sugiura
patent: 4525036 (1985-06-01), Fujibayashi et al.

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