Rear focus conversion lens

Details Rear focus conversion lens Rear focus conversion lens

1983-01-21

1986-05-27

Corbin, John K.

350465, 350469, G02B 934, G02B 960, G02B 1502

Patent

active

045912343

ABSTRACT:
A rear conversion lens removably mounted between an objective lens and a camera body for making the combined focal length of the rear conversion lens and the objective lens greater than the focal length of the objective lens includes a converter barrel, a lens group of negative refractive power movable in the converter barrel along the optical axis, and means for moving the lens group of negative refractive power along the optical axis. Focusing to objects from infinity to a short distance is effected by the movement of the lens group of negative refractive power by said moving means.

REFERENCES:
patent: 4206971 (1980-03-01), Hamanishi et al.
patent: 4253736 (1981-03-01), Momiyama

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