Many people talk about "Canikon". Some have used Nikon lenses on Canon bodies, a few have even used Canon lenses on Nikon bodies. Few have used Canikon lenses on a Leica. Maybe me and the friend that I lent this one to for a few months. This lens is made from optical components of Canon and Nikon Sonnar formula lenses, the front section of a Canon 50mm F1.5, rear section of a Nikkor 5cm F1.4 Nikkor-SC, and focus mount from a third Canon 50/1.5. All in the parts bin. This lens is rangefinder coupled across the full focus range, which "was a trick to pull off". It is the King of the over-corrected for spherical aberration Bokeh look, Baby. Wide-Open on the M9.