I had no idea this lens existed. It's not even listed in the Canon Camera Museum website. The only Canon LTM 50mm f/1.5 lens I was previously aware of is the all-chrome version. How interesting that they made this version, too - I wonder if it is the same optical formula as the chrome version (7 elements in 3 groups) or if it more closely resembles the 50mm f/1.4 (6 elements in 4 groups)? I understand the former is a Sonnar design, while the latter is a Planar design, but don't quote me on that.