Photographic objective having a focusing control with prevention

Details Photographic objective having a focusing control with prevention Photographic objective having a focusing control with prevention

1979-03-19

1981-08-18

Corbin, John K.

G02B 1514

Patent

active

042843316

ABSTRACT:
An optical system comprising, from front to rear, a first lens group movable for focusing, a second lens group movable for focusing and a third lens group stationary during focusing, whereby change in angular field of view of the photographic objective is prevented from occurring during focusing by controlling axial movement of the aforesaid first and second lens groups in a predetermined relation so as not to change in position the rear principal point of the entire lens system.

REFERENCES:
patent: 3632188 (1972-01-01), Nakamura
patent: 4124274 (1978-11-01), Tanaka et al.

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