Unless you are intending to do macro, don't get a macro. There have been several version of the Nikon 180/2.8. They are wonderful for people and give great out of focus backgrounds. The MF ones aren't very expensive used. (you could probably get one with a matching body for $500) The throat dia. is smaller than the K mount. One possible problem is that the flim plane to lens mount flange distance is, I think, greater on Nikons. If it is, you would lose infinity focus without something something fancy.
BR From: Shel Belinkoff <[EMAIL PROTECTED]> However, I'm leaning more towards a simpler lens - just a plain old tele, no AF, no magic elements. Sheesh, how boring <L>