Wide angle zoom lens of long back focal distance

Details Wide angle zoom lens of long back focal distance Wide angle zoom lens of long back focal distance

1987-11-25

1989-06-13

Arnold, Bruce Y.

350450, G02B 1516, G02B 964

Patent

active

048386669

ABSTRACT:
A wide angle zoom lens of increased back focal distance comprising, from front to rear, a first lens unit of negative power, a second lens unit of positive power, and a third lens unit of positive power, the first and second lens units axially moving in differential relation to effect zooming, while holding the third lens unit stationary, and satisfying the following conditions:

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