1982-07-13
1984-08-28
Mathews, A. A.
3541951, 350255, G03B 300, G02B 704
Patent
active
044681070
ABSTRACT:
A macro-focusing rear converter lens system adapted to be inserted between a camera body and a master lens assembly comprises a cylindrical main body which is mounted on the camera body. A rear converter lens assembly for elongating the focal length of the master lens is mounted in fixed relation on the camera body. The master lens assembly is mounted on the front end of a tube which is fitted coaxially within the main body and is movably axially by means of a helicoidal threaded rotatable ring interposed between the main body and the tube on which the master lens assembly is mounted. The interval between the camera body and the master lens assembly can thus be varied by rotating the rotatable ring. A leverage system in the main body transmits an F number signal from the master lens system to the camera body.
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Adams Bruce L.
Burns Robert E.
Lobato Emmanuel J.
Mathews A. A.
Yabe Optical Inst. Mfg. Co., Ltd.
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