Fast compact zoom lens

Details Fast compact zoom lens Fast compact zoom lens

1984-08-27

1986-11-11

Corbin, John K.

G02B 1514

Patent

active

046219056

ABSTRACT:
A fast compact zoom lens comprising a varifocal section followed on its image side by an image forming section, the varifocal section including, from front to rear, a first lens unit of positive power for focusing, a negative second lens unit movable for variation of the magnification, a third lens unit movable along with the second lens unit to compensate for the image shift, and a positive fourth lens unit stationary during zooming. The image forming section includes a front unit and a rear unit with an air space therebetween, the front unit consisting of a positive lens with its front surface being a strong refracting surface and convex to the front, a meniscus negative lens concave to the front, and a positive lens with its front surface being a strong refracting surface and convex to the front, and the rear unit consisting of a negative meniscus lens convex to the front, a positive meniscus lens concave to the front, and a positive lens with its front surface being a strong refracting surface and convex to the front.

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