Zoom lens system

Patent

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Details

350426, 350427, G02B 704

Patent

active

044653433

ABSTRACT:
The present invention is directed to a three-group type wide angle zoom lens system which comprises, from the object to the image side, a first lens group of a negative refractive power movable along the optical axis for zooming, the first lens group including at least two positive lens elements and at least one negative lens element, a second lens group of a positive refractive power movable separately from the first lens group along the optical axis for zooming, the second lens group being of the triplet type formed by sandwitching a negative refractive power component in between a pair of positive refractive power components, and a third lens group of a positive refractive power movable separately from the first and second lens groups along the optical axis for zooming, the third lens group including at least one positive lens element, wherein the lens system fulfills the following condition:

REFERENCES:
patent: 3891304 (1975-06-01), Muszumanski et al.
patent: 4170402 (1979-10-01), Nakagawa

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