Camera extension: the length of bellows in a process camera. It is the distance between the lens diaphragm and the image plane.
暗箱：制版照相机上可以伸缩的部份，它连接起镜头和影像平面。
Process camera: a camera designed specifically for graphic arts photography, that is, repro-photography, AS distinct from original photography.
制版照相机：专为印刷照相用的相机；即是作复制照相，有别于原景物照相。
Process camera: a camera designed specifically for graphic arts photography, that is, repro-photography, AS distinct from original photography.
制版照相机：专为印刷照相用的相机；即是作复制照相，有别于原景物照相。
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