Photographic objective which prevents variation in angular field

Details Photographic objective which prevents variation in angular field Photographic objective which prevents variation in angular field

1979-11-14

1981-07-14

Clark, Conrad J.

350427, G02B 1518

Patent

active

042783313

ABSTRACT:
The photographic objective optical system disclosed keeps an exit pupil stationary during focusing, thereby rendering it possible to maintain the angle between a ray of light incident upon the entrance pupil and the systems optical axis constant during focusing. This way variation of the angular field of view during focusing can be avoided.

REFERENCES:
patent: 3682534 (1972-08-01), Cook et al.
patent: 3705759 (1972-12-01), Cook et al.
patent: 4099845 (1978-07-01), Takesi et al.
patent: 4110006 (1978-08-01), Ikemori
patent: 4124274 (1978-11-01), Tanaka

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