Wide-angle zoom lens system

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

1992-09-18

1994-10-25

Look, Edward K.

Optical: systems and elements

Lens

With variable magnification

359687, G02B 1514

Patent

active

053594576

ABSTRACT:
A wide-angle zoom lens system comprises, from the object side to the image side, a first positive lens unit being stationary on an optical axis during a zooming operation, a second negative lens unit shifting along the optical axis during the zooming operation, a third positive lens unit being stationary on the optical axis during the zooming operation, and a fourth positive lens unit shifting along the optical axis during the zooming operation, wherein the refractive power of the first and second lens units fulfills the predetermined conditions.

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patent: 5221994 (1993-06-01), Nishio
patent: 5231540 (1993-07-01), Shibata

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