Focus detection device for objective lens

Details Focus detection device for objective lens Focus detection device for objective lens

1996-12-09

1998-08-18

Malley, Daniel P.

Photography

With exposure objective focusing means, focusing aid, or...

Plural focusing or rangefinding areas

396 89, 396111, 396121, G01J 120

Patent

active

057970491

ABSTRACT:
A focus detection function is disposed on the focal plane of an objective lens. The in-focus state of the objective lens is determined with respect to a plurality of range-finding regions in a photographic range by employing the focus detection function. A correction value of the objective lens corresponding to a predetermined range-finding region among the plurality of range-finding regions is already stored, thereby finding correction values corresponding to regions other than the predetermined region. As a result, focus detection with respect to the regions other than the predetermined region can be performed.

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