I was able to give some new life to a dead Leica 50mm "Summar" f2.0 LTM (1930s) lens by hacking/adapting it to Canon EOS mount and adding a focusing helicoid. To use this lens on a Canon DSLR I will still need to do some adjustments to the rear element. It is close. Works fine without adjustments and focuses to infinity on the EPIC X. All the smooth OOF and Leica glow you can handle and then some. This lens flares out of control... beautiful soft vintage looks.