Focal point position correction apparatus

Photography – Having variable focal length of camera objective – Having focus operation

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Details

396 80, 396 81, 396 87, G03B 118

Patent

active

056874030

ABSTRACT:
A focal point position correction apparatus for a camera with a zoom lens system, has an adjustment amount calculation device for calculating an adjustment amount .delta.h of at least one lens unit Gh in the zoom lens system using a formula based on focal length information that defines a change amount corresponding to the focal length of the entire lens system and correction coefficients pre-stored for back focus adjustment, and a lens unit driver for moving the lens unit Gh by the adjustment amount .delta.h along the optical axis in the respective focal length states so as to correct any deviation, of the focal point position with respect to the film surface of a best image surface, caused by manufacturing errors, over the entire zooming range.

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patent: 5416639 (1995-05-01), Yamanashi
patent: 5442485 (1995-08-01), Yamanashi

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