Rear-focus conversion device lens for telephoto lens

Details Rear-focus conversion device lens for telephoto lens Rear-focus conversion device lens for telephoto lens

1984-07-23

1987-03-31

Corbin, John K.

G02B 936, G02B 960, G02B 1302

Patent

active

046538771

ABSTRACT:
A rear-focus conversion lens device is interposed between an objective lens and a camera body so as to provide a focal length of a combined lens system with the objective lens greater than that of the objective lens. The conversion lens device has a movable lens system which is movable on an optical axis relative to the objective lens and the camera body. The conversion lens device can focus on an object falling within a range of infinity and a predetermined short distance by moving the movable lens system. The conversion lens device satisfies certain conditions.

REFERENCES:
patent: 4126378 (1978-11-01), Ogino
patent: 4206971 (1980-06-01), Hamanishi et al.

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