Zoom lens system

Details Zoom lens system Zoom lens system

1984-07-18

1988-12-06

Corbin, John K.

G02B 1516

Patent

active

047892269

ABSTRACT:
A zoom lens system comprising a first lens group having positive refractive power, a second lens group having negative refractive power, a third lens group having positive refractive power, and a fourth lens group having positive refractive power wherein the fourth lens group comprises a positive, positive and negative lens components, the zoom lens system having a large zoom ratio and large aperture ratio, i.e., F/5.0, and being compact in size and low in price.

REFERENCES:
patent: 4094586 (1978-06-01), Sato et al.
patent: 4359270 (1982-11-01), Okudaira
patent: 4372654 (1983-02-01), Fujioka et al.
patent: 4420226 (1983-12-01), Kitagishi
patent: 4439017 (1984-03-01), Yamaguchi
patent: 4456341 (1984-06-01), Kato
patent: 4494828 (1985-01-01), Masumoto et al.
patent: 4523814 (1985-06-01), Okudaira

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