I currently have something of a surplus of working MR-4 Leicameters and have a friend in the USA, who uses a DS M3, that might be interested. He asked if the MR-4 Leicameter fits and couples with a DS M3, given that the speeds below 1/250th are slightly different. I told him I did not know but I knew a group of folk who would know. My feeling is that it may not fit any camera younger than an M4.
What do folk think - fit or not fit and are the different speeds significant?
Wilson