Incompatible CL Lenses??? When the CL was new, Leica made it clear the CL's 40/2 Summicron and 90/4 Elmar (or the 40/2 and 90/4 Rokkors for the Japanese market) may not focus correctly on M cameras. The reason given was the different shape of the CL lenses' focusing cam. As time went on, users became more and more suspicious that this incompatibility claim may have been marketing hype so the inexpensive CL lenses would not decrease sales of the more expensive M lenses. Perhaps some CL lenses really don't focus accurately with some M bodies, but I have yet to see it. This issue is a matter of hot dispute, depending a lot upon how much you trust father Leitz.