Erik van Straten
Veteran
The 50/1.5 black M Nokton has a much more traditional look and handling than the M chrome version, which was modeled after the original 1954 Leica screw mount Nokton.
I never tried a black one, can be that the black one has aluminium threads. The chrome one is very smooth with its brass threads. Mechanically it is a jewel, but that barrel distortion ...
Erik.