Lens Adapter: Lens adapter ring is compatible for Canon FD Camera (A-1, AE-1 Program, F-1, FTb and others); Compatible Lens: M42 lenses (for Zeiss, Pentax, Praktica, Mamiya, Zenit)
Manual Diaphragm control: Automatic diaphragm, auto-focusing, or any other functions will not operated with using this adapter. Exposure and focus has to be adjusted and controlled manually. 'Stop-down mode' will need to be used when metering since the lens does not have the ability to have its aperture controlled by the camera body.
Unique Design: Take advantage of our engineering with the optic glass that is used to make up the focal flange distance difference between the lens and camera (distance between the lens flange and film/sensor plane).This corrective lens in our adapter allows an older lens to properly focus to on the newer camera body.
focus position: No ROM connection on the adapter. the position of the mark 【∞】of the telephoto lens or super telephoto lens is shifted slightly to the positive side to enable focus adjustment even when focus shift is caused due to temperature changes.
Solid : Lens mount adapter is made of stable alloy with precise design and high technology, long-term use is not a problem. Smooth surface for effortless mount, fine made to be light weight and strong.