@Birma: I have tried hunting down a Minolta 50/1.7 locally for a reasonable price. In this hunt I have felt like the guys in the show "Pawn Stars" on the History Channel were sellers always think they have something really specials that's worth a lot of money. Most of the time, they just don't! I have seen ridiculous prices for this lens, with just no budging. I've decided to stop this search and bought a SAM 50/1.8. Not the same build, but it's new, with 3 years warranty and a good IQ for it's price. Anyway, thank you for the suggestion!
I'm still very much liking the Rokkor 50/1.7 on my NEX. The lens is great for the price. I went out this weekend with the full compliment of lenses for the NEX, but ended up shooting everything with the 50
@Richard: thank you for the suggestion too. Although I don't need it anymore, I still like to see your pictures
I bought the CZ Flektogon 4/20 DK offered a few weeks ago. It's beat up, but I was able to clean the aperture blades (they were pretty sticky) and back elements. The problem I still have is the front element which has a bad case of balsam separation. DK explained it being "a fractal-looking breakdown of the lens glue". I took the lens apart, but as far as I can see, you cannot take the front lens apart. I'm still looking for an answer. Also, I still need an adapter for it. It's M42 mount. Learned a lot from the disassembly exercise. Very solid build those lenses!
Mark