Compact and high-speed wide-angle zoom lens system

Details Compact and high-speed wide-angle zoom lens system Compact and high-speed wide-angle zoom lens system

1989-04-28

1991-07-30

Arnold, Bruce Y.

G02B 15177, G02B 1318

Patent

active

050354922

ABSTRACT:
A wide angle zoom lens system having a high level of brightness includes a zooming subsystem comprising first and second movable lens units and a fixed third lens unit. The first lens unit has at least one aspherical lens surface. In the preferred embodiment, a diaphragm is disposed between the second and third lens units and is displaced independently of the second lens group when zooming.

REFERENCES:
patent: 4810072 (1989-03-01), Takahashi

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