Zoom lens

Details Zoom lens Zoom lens

1980-10-01

1984-07-31

Corbin, John K.

G02B 1518

Patent

active

044626649

ABSTRACT:
A zoom lens having a large zoom ratio and capable of close focusing comprising a first positive grouping movable axially for focusing, a second negative grouping, and a third positive grouping movable simultaneously with the second grouping, but in opposite directions to vary the equivalent focal length of the lens. The third grouping may have sub-groupings movable at different rates in the same direction.

REFERENCES:
patent: 2847907 (1958-08-01), Angenieux

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