Extension tube for use in close-up photography

Details Extension tube for use in close-up photography Extension tube for use in close-up photography

1975-11-11

1977-01-11

Hix, L. T.

354 46, G03B 1756

Patent

active

040030687

ABSTRACT:
An extension tube inserted between a single lens reflex camera body and an interchangeable objective lens barrel to extend the photographable range intrinsic to the camera is provided with an aperture value transmitting device through which the diaphragm on the lens barrel side is presettable as the aperture value is determined on the camera body side, thereby it being made possible to effect automatic exposure aperture control when making an exposure at a camera-to-object distance shorter than the lower limit of the photographable range. A transmitting device, for coupling the lens and camera, is also provided for achieving manual exposure control.

REFERENCES:
patent: 3500735 (1970-03-01), Mite et al.
patent: 3590715 (1971-06-01), Schops
patent: 3722390 (1973-03-01), Schlapp et al.
patent: 3782261 (1974-01-01), Araki
patent: 3879741 (1975-04-01), Saito et al.

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