Zoom lens able to obtain focal lengths beyond the zooming range

Details Zoom lens able to obtain focal lengths beyond the zooming range Zoom lens able to obtain focal lengths beyond the zooming range

1985-02-26

1987-12-08

Corbin, John K.

350428, G02B 704, G02B 1516

Patent

active

047115343

ABSTRACT:
A zoom lens including, from front to rear, a first lens unit of negative power and a second lens unit of positive power with the separation therebetween being varied to effect zooming. The first lens unit is moved to effect focusing, wherein with the first lens unit focusing a finite object distance on the wide angle side, the second lens unit moves rearward to obtain focal lengths beyond the zooming range.

REFERENCES:
patent: 4266860 (1981-05-01), Hayashi
patent: 4465343 (1984-08-01), Horimoto

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