Front conversion adapter for lens shutter type of zoom lens came

Details Front conversion adapter for lens shutter type of zoom lens came Front conversion adapter for lens shutter type of zoom lens came

1988-09-15

1990-07-17

Adams, Russell E.

354400, 354199, 354295, G03B 1332

Patent

active

049424149

ABSTRACT:
A front conversion adapter which can be attached to the front face of a lens shutter type of camera having a zoom lens and a finder optical system, wherein a lens frame of the zoom lens moves in accordance with the zooming operation. The front conversion adapter has an adapter body which can be attached to a camera body, and a conversion optical system which is located in front of the zoom lens and which moves in the optical axis direction thereof to change the focal length of the zoom lens. The conversion optical system is supported by an adapter lens frame so as to move in the optical axis direction in association with movement of the lens frame of the zoom lens and in accordance with zooming operation.

REFERENCES:
patent: 3194139 (1965-07-01), Babcock
patent: 3260184 (1966-07-01), Pagel et al.
patent: 3836934 (1974-09-01), Suzuki et al.
patent: 4219264 (1980-08-01), Rodeck
patent: 4490031 (1984-12-01), Mineshima
patent: 4728973 (1988-03-01), Taniguchi et al.
"One-Piece, One-Touch!", Japan Camera Trade News, p. 16, May 85.

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