Close-up focusing device in a photographic lens assembly

Details Close-up focusing device in a photographic lens assembly Close-up focusing device in a photographic lens assembly

1975-03-25

1976-12-14

Sacher, Paul A.

350255, G02B 710

Patent

active

039972453

ABSTRACT:
In a photographic lens assembly having a plurality of lenses and held in a frame, an improved close-up focusing device in which an actuating shaft is rotatably provided in the frame and a transmission means connects the shaft and a mount holding one lens of the assembly in such a manner that the mount is moved relative to the frame in a direction parallel to the optical axis of the assembly by the rotation of the shaft, whereby close-up focusing is effected at, and independent of, any setting of the zoom lens assembly.

REFERENCES:
patent: 2732763 (1956-01-01), Back et al.
patent: 2940373 (1960-06-01), Berg et al.
patent: 2984167 (1961-05-01), Staubach
patent: 3233514 (1966-02-01), Eberhardt

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