very rare and expensive lens found.. need help :)

Well, some of the Schneider 4x5 enlarger lenses have been pretty good -- and one Omegaron 135mm I have is great (despite some separation!) -- but 135-format enlarger lenses I've tried are all poorer than cheap macros. For example, the Minolta 50mm f/3.5 is really great. Even the old non-macro Vivitar 135mm f/2.8 does better on a bellows.

Anyway, feel free to try and like these lenses, but aside from the flat field at close focus I have not been impressed....