Zoom lens

Details Zoom lens Zoom lens

1980-12-05

1983-07-19

Corbin, John K.

G02B 1518

Patent

active

043940722

ABSTRACT:
A new and improved zoom lens comprises four groups. The powers of the groups from the object end to the image end are positive, negative, negative, and positive, respectively. The first group is stationery for zooming but moves for close focusing. The second and third groups move in the same direction for zooming.

REFERENCES:
patent: 2782684 (1957-02-01), Hopkins
patent: 3614207 (1971-10-01), Basista
patent: 4017161 (1977-04-01), Tsuji

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