Wide Open -- NEX-5 & Minolta MC Rokkor-PF 55mm f1.7. Click to see larger.
So what bargain are we talking about? The Minolta MC Rokkor 55mm f1.7. Truly this lens can be had for the cost of a lunch, very often at around $10 to $15. This lens is all metal made, like the MC Rokkor-PF 58mm f1.2, MC Rokkor-PF 85mm f1.7, all of the MC Rokkors share the same great built quality.
Sharp as a knife @ f5.6 -- NEX-5 & Minolta MC Rokkor-PF 55mm f1.7. Click to see larger.
These Minolta manual focus 50mm f1.7 lenses are often over looked. Partly because they really can't be used on other DSLRs without special mount adapters to make them focus to infinity. But it's not a problem for Micro 4/3 and Sony NEX (and Samsung NX series) cameras. I am sure they will go up in price once people find out how good they are.
Woman in red -- NEX-5 & Minolta MC Rokkor-PF 55mm f1.7 @ f8.
Really, optically, this lens is no worse than a modern 50mm f1.8, maybe except the flare control is not as good as the modern counterpart, but the built quality more than makes up for that. If you have a Micro 4/3 or Sony NEX camera, try one. Guaranteed you won't be disappointed.