Older russian lenses (for Zenit cameras) are very good, and cheap.
http://www.iceinspace.com.au/forum/s...ht=Tair+11A=#9
(this is the sharpest lense (stopped down of course) I ever had (in corners there is a bit of coma, though).
Also, see here, older canon (FD) lenses are very good.
http://www.iceinspace.com.au/forum/s...50mm+f1.4+lens
http://www.iceinspace.com.au/forum/s...s+modification
http://www.iceinspace.com.au/forum/s...ht=canon+100mm
http://www.iceinspace.com.au/forum/s...ht=canon+300mm
(Internal element of 300mm was later cleaned successfully with vinegar - it is now "as new")
Some photos taken with 50mm and 100mm FD lenses are on the link below:
http://www.flickr.com/photos/72914767@N03/?saved=1