Three-group zoom lens having a first positive refracting lens gr

Details Three-group zoom lens having a first positive refracting lens gr Three-group zoom lens having a first positive refracting lens gr

1998-02-12

2000-03-21

Mack, Ricky

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

060409487

ABSTRACT:
In a zoom lens comprising three lens groups of positive, positive, and negative in which, upon changing power from its wide angle end to telephoto end, all the three lens groups are moved toward the object side while changing distances between the lens groups, so as to attain variable power; each lens form of the first lens group is specified, and predetermined conditional expressions are satisfied, so as to yield optical performances which are satisfactory to professionals and high-standard amateurs. Upon changing the power from the wide angle end to telephoto end, the air gap between the first lens group G.sub.1 and the second lens group G.sub.2 increases, while the air gap between the second lens group G.sub.2 and the third lens group G.sub.3 decreases. Further, this zoom lens satisfies the following conditional expressions (1) to (3):

REFERENCES:
patent: 4854683 (1989-08-01), Ozawa
patent: 4909613 (1990-03-01), Kikuchi
patent: 5144489 (1992-09-01), Shibayama

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