By the way, the best MF lens I have so far (the most satisfying experience) is the Pentax 50mm f2.8 from the Pentax Auto 110. I don't mind the fixed aperture (the Pentax Auto 110 had the aperture on the camera body) since I use it for portraits with OOF background. The 18mm and 25mm are nothing to write home about, not very fast and not very interesting results. But the 50mm is great, tiny, easy to focus, no vignetting, reasonnably sharp and with fairly nice OOF. I saw two copies on KEH today for 25 bucks, and there is a cheapo, not great but functionning adapter available on the interwebs for about the same. 50 bucks for this jewel is a great deal in my humble opinion, at least while you save for the Oly 45mm. ps no, I don't get a commission!