Camera system having power zoom lens

Details Camera system having power zoom lens Camera system having power zoom lens

1995-02-17

1997-04-01

Adams, Russell E.

Photography

Having variable focal length of camera objective

Automatic change of focal length

396 82, G03B 1336

Patent

active

056171730

ABSTRACT:
A camera system having a power zoom lens and an automatic focusing device, comprising a zoom motor for zooming the power zoom lens, a focal length detecting device for detecting a focal length of the power zoom lens, an object distance detecting device for detecting a distance of an object which is in focus, and a calculation device for calculating an image magnification in accordance with the focal length and the object distance detected by the focal length detecting device and the object distance detecting device, respectively, and then calculating a target focal length at which the image magnification is kept constant, in accordance with the object distance detected by the object distance detecting device.

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