As a collector & a devotee of both the Contax & Leica systems, I have some of these adapters & they do work. I think it's much more cost-effective to get the Canon 50/1.5 or 50/1.4 Nikkor-S in LTM as they're just Japanese Sonnars (tweaked/stretched a bit in the case of the Nikkor). The LTM CZJ Sonnars can also be found @ "decent" prices (approx. $400 in excellent optical condition), but there are a lot of fakes coming out of the former USSR & the build quality of the genuine ones is inferior to the Canons & Nikons.