公开(公告)号：US4003068A

公开(公告)日：1977-01-11

申请号：US631129

申请日：1975-11-11

申请人： Shigeru Hashimoto ,  Masaharu Ito

发明人： Shigeru Hashimoto ,  Masaharu Ito

IPC分类号： G03B17/14 ,  G03B17/56

CPC分类号： G03B17/14

摘要： 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.

摘要翻译： 插入在单个透镜反射照相机主体和可互换物镜镜筒之间以延长照相机本身的照相范围的延伸管设置有光圈值传输装置，透镜镜筒侧的光阑通过该孔径值传输装置可预设，因为光圈值为 在相机机体侧确定，从而可以在比可拍摄范围的下限短的相机到物体距离进行曝光时实现自动曝光光圈控制。 还提供了用于连接透镜和照相机的发射装置，用于实现手动曝光控制。