1981-05-15
1983-06-21
Adams, Russell E.
354 31, 354 59, G03B 708
Patent
active
043891071
ABSTRACT:
An arrangement for the automatic critical focusing of optical systems in mirror reflex cameras provided with a partially transmitting reflex mirror, an image field lens arranged in the viewfinder ray path as well as a range-finder image plane, which is equivalent to the film plane. The range-finder image plane, which contains image-forming and deflecting optical components, is arranged in the optical axis of the viewfinder system. By these means a reduction of the expenditure of optical components as well as of the required assembly and adjustment expenditure for automatic critical focusing devices is achieved.
REFERENCES:
patent: 3643575 (1972-02-01), Ono
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4104650 (1978-08-01), Hosoe et al.
patent: 4171155 (1979-10-01), Jyojiki et al.
Konig Gottfried
Lenk Michael
Adams Russell E.
Veb Pentacon Dresden Kamera und Kinowerke
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