In order to my new camera with MFT - the old familiar bayonet M42 - to use lenses, I had bought that adapter. It is a real pleasure to discover long unused focal lengths from "analog times" again! Even intermediate rings for close-ups or T2 - adapter can be screwed. The infinity - setting the lenses work, the first use the scales for aperture and distance should be in the up position, the focus is not changed. Very useful is also the magnifier settings on my camera. The original objective was with frequent changes have not Kuststoffbajonett.
The adapter is solid and accurately processed and therefore highly recommended.