Patent
1975-04-03
1976-11-30
Corbin, John K.
350187, G02B 1514
Patent
active
039945723
ABSTRACT:
A macro-photography varifocal lens assembly is provided for attachment to a camera body. The lens assembly can include a first lens group of negative refractive power and a second lens group of positive refractive power further supplemented by a master or auxiliary lens group of positive refractive power. One of the first and second lens groups are mounted for relative movement to vary the overall focal length of the lens assembly as the lens group moves across a predetermined range of movement. The image plane of the refracted image is continuously shifted from an initial predetermined position at one end of the range of movement towards the object and then away from the object to return to the initial predetermined position at the other end of the range of movement. This relative movement or shift of the image plane towards the object being sufficient to focus an image of an object in a macro-photography range. Various embodiments of the present invention can accomplish the combination of a lens system having two or more focal lengths with an intermediate macro-photography capability.
REFERENCES:
patent: 3227042 (1966-01-01), Smejkal et al.
patent: 3466113 (1969-09-01), Bertele
patent: 3694056 (1972-09-01), Muszumanski
patent: 3884555 (1975-05-01), Suwa et al.
Uesugi Kyozo
Yasukuni Mitsuo
Clark Conrad
Corbin John K.
Minolta Camera Kabushiki Kaisha
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