Large aperture ratio zoom lens system

Details Large aperture ratio zoom lens system Large aperture ratio zoom lens system

1985-06-24

1988-06-07

Corbin, John K.

350423, 350432, G02B 1500

Patent

active

047492678

ABSTRACT:
A large aperture ratio 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 negative refractive power, and a fourth lens group comprising a front subgroup and a rear subgroup wherein the front subgroup comprises at least one negative lens component and the rear subgroup comprises at least one positive lens component, the large aperture ratio zoom lens system having at least one aspherical surface in the front subgroup, having a short overall length, a long back focal length, high resolving power and high performance, and being capable of coping with the use with an electronic image pick-up device.

REFERENCES:
patent: 4281906 (1981-08-01), Tanaka
patent: 4416518 (1983-11-01), Hugues et al.
patent: 4572620 (1986-02-01), Kikuchi

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