Auxiliary cylinder for camera

Details Auxiliary cylinder for camera Auxiliary cylinder for camera

1979-01-02

1981-09-29

Punter, William H.

G02B 702

Patent

active

042919444

ABSTRACT:
An auxiliary lens holding cylinder has a main cylinder having a lens holder on one end and a camera mounting fixture on the other end and a sub-cylinder having a built-in lens for one of a variety of types of photography is coaxially removably mounted in the main cylinder. The built-in lens can be a plus type lens or a minus type lens. The main cylinder has a sub-cylinder holder mounted therein coaxial with the main cylinder, and guiding and locking grooves in the holder cooperating with a boss on the sub-cylinder for guiding the sub-cylinder into the holder and locking the sub-cylinder in the holder. A spring on the main cylinder urges the sub-cylinder into locking engagement with the guiding and locking grooves.

REFERENCES:
patent: 993121 (1911-05-01), Stone et al.
patent: 1687818 (1928-10-01), Wollensak
patent: 2008991 (1935-07-01), Nowack
patent: 2496928 (1950-02-01), Bing et al.
patent: 2853925 (1958-09-01), Lee
patent: 2902901 (1959-09-01), Back
Jones, L. E., "Use of Supplementary Lenses", Photo Technique 2-1941, pp. 46-49.

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