Zoom lens system

Details Zoom lens system Zoom lens system

1977-02-22

1979-01-23

Clark, Conrad J.

G02B 1518

Patent

active

041357868

ABSTRACT:
A zoom lens system comprising, from front to rear, a focusing lens group having a positive refractive power, a front movable lens group, a middle movable lens group, a rear movable lens group and a relay lens group, the front and middle lens groups having negative refractive powers. When zooming, these three movable lens groups are moved simultaneously and independently of each other in such a manner that the front and middle groups at the telephoto side occupy nearer positions to the image plane than those which they occupy at the wide-angle side. The axial separation between the front and middle groups at the telephoto side is smaller than that at the wide-angle side. Further, the front and rear surfaces of the middle movable lens group are convex toward the image side.

REFERENCES:
patent: 3840290 (1974-10-01), Betensky

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