Rear-focus zoom lens system

Details Rear-focus zoom lens system Rear-focus zoom lens system

1995-01-23

1996-12-10

Epps, Georgia Y.

357684, G02B 1514

Patent

active

055836992

ABSTRACT:
A rear-focus zoom lens system with four lens group. A stationary first lens group of a positive refractive power; a second lens group of a negative refractive power that moves for zooming; a stationary third lens group of a positive refractive power; a fourth lens group of a positive refractive power that moves for zooming and focusing. The first through fourth lens groups are arranged in that order from the object side. This zoom lens system also satisfies the following conditional expression:

REFERENCES:
patent: 4776679 (1988-10-01), Kitagishi et al.
patent: 4842386 (1989-06-01), Kitagishi et al.
patent: 5078481 (1992-01-01), Nakayama et al.
patent: 5111338 (1992-05-01), Nakayama

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