Focal length varying device for camera

Details Focal length varying device for camera Focal length varying device for camera

1989-01-13

1989-09-26

Perkey, W. B.

350429, G03B 50, G02B 1500

Patent

active

048704393

ABSTRACT:
A focal length varying device for a camera comprises a photo taking optical system having a variable focal length; a discriminating device for discriminating whether or not adequate photographing is possible; and a system for automatically changing the focal length of the photo taking optical system on the basis of the result of discrimination made by the discriminating device.

REFERENCES:
patent: 4290679 (1981-09-01), Vockenhuber

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