I know some of you are using older Leica glass on the MFTs, and I was wondering what your experiences are. I am thinking about older 50/1.5 Summarits or collapsible 50/2 Summitars, but also about older Elmars like the 90 or 135. Some of the older ones occasionally seem to go for reasonable prices on ebay, but I was wondering what to pay attention to - besides looking for a really good copy. What do I have to expect? Are some better than others? I have seen a few examples here on getdpi but was hoping to bundle your experiences in one thread... So far, I am only using a Summicron 50 from the 80s (and love it), but I have a 1937 Hektor in the mail from servicing. I just like the look of the older collapsible ones, including the 90mm Elmar. Anything I should stay away from? And - oh, the blasphemy - what about some of the Russian copies?