Photographic objective stabilized against change of angular fiel

Details Photographic objective stabilized against change of angular fiel Photographic objective stabilized against change of angular fiel

1979-12-19

1982-06-29

Corbin, John K.

G02B 1518

Patent

active

043369839

ABSTRACT:
A photographic objective having a front lens group movable for focusing and a stationary rear lens group focusing whose back focal point is made coincident with the point of position of the exit pupil of the entire lens system to prevent the change in angular field of view in the object space from occurring during focusing.

REFERENCES:
patent: 3682534 (1972-08-01), Cook et al.
patent: 4099845 (1978-07-01), Takesi
patent: 4278331 (1981-07-01), Tanaka
patent: 4284331 (1981-08-01), Tanaka

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