Compact zoom lens with high zoom ratio

Details Compact zoom lens with high zoom ratio Compact zoom lens with high zoom ratio

1989-03-27

1991-02-12

Arnold, Bruce Y.

G02B 1514

Patent

active

049919431

ABSTRACT:
A compact high zoom ratio lens comprising from the object end a front positive stationary lens unit, a negative variating lens unit, a positive variating lens unit and a compensate lens unit, the variating lens units and the compensator lens unit being axially moveable to vary the equivalent focal length of said lens, the compensator group having an object magnification change of less than twenty-five percent over the zoom range of the lens.

REFERENCES:
patent: 3192829 (1965-07-01), Yamaji

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