Sounds like it can be fully utilized (with eyes) on my M3 now, after stud removal on my M5, but only as a normal focusing, but terrific 50 on my M7, (and forget about the M9). I had a rigid cron and know how wonderful the optics are, especially for smooth B&W. I want that look back in the bag, but mostly I am eager to work with a very close focusing
50 on an M camera, something I have missed since switching from DSLR to M shooting. best....Peter