Zoom lens system

Details Zoom lens system Zoom lens system

1975-01-23

1976-07-20

Sacher, Paul A.

G02B 1516, G02B 1518

Patent

active

039703673

ABSTRACT:
A zoom lens system comprising five lens groups of which the first, third and fifth groups are convergent, the second group is divergent, and the fourth group is a divergent doublet consisting of convergent and divergent elements cemented together, the cemented contact surface being concave toward the front, in which the second group is axially movable to effect magnification variation, and the third group is axially movable forward and then rearward when zooming the second group from an extreme focal length range to the other, said zoom lens system being characterized by the following relationships in combination:

REFERENCES:
patent: 3507555 (1970-04-01), Isshiki
patent: 3615125 (1971-10-01), Higuchi et al.

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