Photography – Having variable focal length of camera objective – Having focus operation
Patent
1997-04-01
1998-12-15
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
396 85, 359705, G03B 1700
Patent
active
058505776
ABSTRACT:
A macro-photographing system in a zoom lens camera includes a lens system having at least a movable front lens group on the object side and a movable rear lens group on the image surface side, a whole-unit driving device which moves the front lens group and the rear lens group together, a relative drive device which relatively moves the front lens group or the rear lens group to vary the distance between the front and rear lens groups, a zoom operation device which sets the focal length by the lens system, and a macro-photographing setting device which sets at least one close object distance. The camera position is fixed when the camera is focused on the object at the close object distance set by the macro-photographing setting device. When the zoom operation means is actuated, at least one of the whole-unit driving device and the relative drive device are actuated to keep the focused state for the close object distance.
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patent: 5150145 (1992-09-01), Haraguchi et al.
patent: 5189559 (1993-02-01), Kaneko
patent: 5223873 (1993-06-01), Tsuboi
patent: 5266992 (1993-11-01), Takaoka et al.
Asahi Kogaku Kogyo Kabushiki Kaisha
Perkey W. B.
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