Photography – Having variable focal length of camera objective – Having focus operation
Patent
1995-06-07
1998-05-12
Perkey, W. B.
Photography
Having variable focal length of camera objective
Having focus operation
396 83, 396 84, 396 90, 359432, 359698, 359700, 359701, G03B 500, G03B 1336, G02B 709
Patent
active
057520950
ABSTRACT:
A magnification change-over device is arranged to be highly suitable for a camera of the kind having a photo-taking lens and a viewfinder arranged independently of each other. The device includes the photo-taking lens having an image magnification which is variable; the viewfinder which is arranged to have an image magnification thereof also variable; an operating device for varying the image magnification of the viewfinder; a detecting device for detecting the magnifying state of the viewfinder; and a driving apparatus for driving the photo-taking lens according to a detection signal of the detecting device when a shutter release operation is performed. After a magnification setting operation is performed on the viewfinder, the change-over device changes the magnification of the photo-taking lens according to the magnification of the viewfinder when a photographing operation is actually performed.
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patent: 4597657 (1986-07-01), Wakabayashi
patent: 5005038 (1991-04-01), Ogawa et al.
Canon Kabushiki Kaisha
Perkey W. B.
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