Zoom lens of the rear focusing type

Details Zoom lens of the rear focusing type Zoom lens of the rear focusing type

1986-01-15

1987-08-04

Corbin, John K.

350423, G02B 964, G02B 15177

Patent

active

046842233

ABSTRACT:
In the disclosed zoom lens of the rear focusing type, three lens groups are axially moved for zooming from the wide angle to the telephoto settings or vice versa. A focusing action is imparted into the second or third lens group counting from the front object end, and the latter groups are arranged for moving in one direction during zooming from the wide angle to the telephoto settings.

REFERENCES:
patent: 2959101 (1960-11-01), Sandback et al.
patent: 3972056 (1976-07-01), Tsujimoto et al.
patent: 4196969 (1980-04-01), Itoh
patent: 4198127 (1980-04-01), Itoh

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