The Yashinon 2/50 and Mamiya 2/50 are both really great lenses. People usually overlook them for the faster lenses, so they sell for under $20 all the time. The Meyer Orseston/Pentacon 1.8/50 is also a good performer and usually cheap.
I frankly would steer clear of west German lenses, their prices have sky-rocketed as many under-informed buyers assume that all German lenses are wonderful. Some of the worst lenses I've owned have been German, and come from reputable companies like Steinheil et al. The problem is the bad ones sell for prices approaching those of the best. The few m42 lenses made in west Germany that may be worth their prices are the Xenon 1.9/50 and the Icarex Ultron 1.8/50 - both of which are expensive these days, but also among the best normals ever offered in M42.
Mamiya's 28mm lens is excellent, and the CZJ Flektogon 4/20 is also excellent.
Last edited by Yashinoff; 11-19-2012 at 11:25 PM. Click to view previous post history.