Patent
1991-07-22
1993-07-13
Adams, Russell E.
354412, 354475, G03B 300, G03B 700, G03B 1718
Patent
active
052278310
ABSTRACT:
A photographing lens system includes at least one zooming lens. A photometric circuit measures brightness of an object. An exposure calculation circuit calculates an exposure value in accordance with an output from the photometric circuit. A distance measurement circuit measures a distance to the object. A magnification setting circuit determines a photographing magnification of an image of the object to be formed on a film arranging surface. An auto-zooming calculation circuit determines a focal length of the photographing lens system in accordance with an output from the magnification setting circuit, and an output from the distance measurement circuit. A drive circuit drives the zooming lens in accordance with an output from the auto-zooming calculation circuit. A switch is turned on upon a first stroke of a release button. A switching circuit outputs a first value in accordance with a setting value of the magnification setting circuit before the switch is turned on, and outputs a second value according to an output from the exposure calculation circuit after the switch is turned on. A display selectively displays the first and second values.
REFERENCES:
patent: 4942417 (1990-07-01), Miyazawa et al.
Itoh Jun-ichi
Kawazoe Mitsuo
Miyazaki Satoshi
Tanbara Yasuo
Adams Russell E.
Noh Jae N.
Olympus Optical Co,. Ltd.
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