Why not get an old collapsible 90/4 Elmar, then? It seems that there are a lot of them around, too.
There's a concrete reason Russian lenses don't work on Leicas, and I would not buy one hoping that it would. I have three, and none work on a Leica, all in exactly the same way (focus behind the subject about 3" at 3', just like the theory predicts), but work fine on a Fed, just as they should. There is no way to "tune them up" so that they work.; if you FULLY understand how they work, you can understand why they don't. I had a laugh today on another board where someone had a "pick the Russian lens" thread. The Russian lens was the one that was focused on the ears instead of the eyes. The owner thought it was fine, just not as sharp, close up. Duh.
Dante Stella gives an excellent explanation of the problem.
Last edited by mdarnton; 12-17-2011 at 06:33 PM. Click to view previous post history.