Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

1997-01-17

1998-09-01

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359682, 359689, G02B 1514

Patent

active

058018875

ABSTRACT:
A wide-angle zoom lens system is provided that has favorable image formation properties and is compact. The system preferably is a two group composition of negative/positive. The first lens group G1 has a negative meniscus lens component L1n having a convex surface facing towards the object side and a positive lens component L1p arranged closer to the image side than the negative lens component L1n. A front lens subgroup of the second group G2F includes, in order from the object side, a positive lens component L2F1 of positive refractive power, a negative lens component L2F2 of negative refractive power and a positive lens component L2F3 of positive refractive power. A rear lens subgroup of the second group G2R includes at least a negative lens component L2Rn and a positive lens component L2Rp.

REFERENCES:
patent: 4571031 (1986-02-01), Kato
patent: 4726667 (1988-02-01), Tachihara

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