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The FotodioX Pro M42 Screw Mount to Micro 4/3-Mount Lens Mount Adapter allows you to mount M42 (42x1mm) screw mount lenses on Micro 4/3 (MFT) Mirrorless Digital Cameras. It allows a M42 lens to act as a macro variable extension tube. The adapter also ensures there is no play between the lens and camera for added security. Automatic diaphragm, auto-focusing, and other functions will not operate correctly while using this adapter. In this case, "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. Infinity focusing is guaranteed.