1993-03-05
1994-12-06
Adams, Russell E.
35419512, G03B 1336, G03B 300
Patent
active
053715667
ABSTRACT:
A camera system incorporating a camera and a conversion lens detachable with respect to the camera and acting to change the focal point distance of a photographing lens, the camera system including: an electric drive device for driving the photographing lens; a setting device for operating the electric drive device to set a focus range to a desired value; a mounting signal generating device for automatically or manually transmitting a signal denoting that the conversion lens has been mounted on the photographing lens; and a control device for operating the electric drive device in accordance with an output from the setting device and for forcibly operating the electric drive device until the focus range is made to be a proper distance if the set focus range is not a proper distance for performing a photographing operation by using the conversion lens when the control device receives an output from the mounting signal generating device.
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patent: 5053798 (1991-10-01), Ohara et al.
Adams Russell E.
Olympus Optical Co,. Ltd.
Weinstein Louis
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