Manual lenses on digital cameras
I have been using AF Fuji lenses (14mm/2.8, 23mm/1.4 and waiting for 56mm/1.2) on my Fuji camera, because these lens are great and work with them is exact, fast and always with a good result. The price of each of them is around € 850 - 1000.
But for pleasure (yes, more for pleasure than for fun) I have bought 4 manual focus russian lenses (Mir-1 37mm/2.8, Industar 50-2 50mm/3.5, Helios 44-2 58mm/2 and Jupiter 37A 135mm/3.5). Their prices: € 10 - 50 (together below € 100). All of them are surprisingly sharp, Helios and Jupiter are "bokeh monsters" and the feeling of the imperfection is simply fantastic.
If you have time for manual focusing and want good lenses for funny price, try these old MF russian or german lenses.