I understand Braun Paxette lens are M39 screw mount but not all are compatible with Leica screw mount cameras because of the longer lens register. I am using a 50mm f2.8 Staebel Braun on a Canon 7 but wondering which other Braun lens will fit on it? The 85mm f5.6 looks like it should fit but what about the 38mm f3.5 that clearly has a big protrusion? Anyone try any of these on a non-Paxette Leica screw mount camera? Thanks.