Zoom lens system for inner focusing

Details Zoom lens system for inner focusing Zoom lens system for inner focusing

1997-10-27

1999-07-27

Epps, Georgia

Optical: systems and elements

Lens

With variable magnification

359689, G02B 1514

Patent

active

059300515

ABSTRACT:
A large high zoom ratio lens system having a large field angle with a zoom ratio of over 3.5 and an F number of about 2.8 to about 3.5 which includes at least a first lens group G1 having a positive refractive power and a second lens group G2 having a negative refractive power. The second lens group G2 includes a negative lens component L2A having at least one aspherical surface, a positive composite lens component L2B, and a negative lens component L2C having a concave surface facing toward the object end wherein the positive cemented lens component L2B is preferably formed of a positive lens having a convex surface facing toward the object end and a negative lens.

REFERENCES:
patent: 5543970 (1996-08-01), Hata

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