Focus detecting system utilizing correction data on aberrations

Details Focus detecting system utilizing correction data on aberrations Focus detecting system utilizing correction data on aberrations

1989-02-07

1990-02-13

Westin, Edward P.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, 354403, 354406, 354408, G03B 300, G02B 711

Patent

active

049009117

ABSTRACT:
A focus detecting system having a passive type automatic focusing function and an active type automatic focusing function. When the passive type automatic focusing function is used, focus detection is performed using light which is incident from a position close to an optical axis of a photographic lens, while in the case of using the active type automatic focusing function, focus detection is performed using light which has passed through a position far from the optical axis of a photographic lens. The focus detection value is corrected using a preset correction value to set the photographic lens in the best image position.

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