Morten, There is no "M" version of the 30/2.8, it is only available in the "K" flavour. Its full name will be either "SMC PENTAX 1:2.8/30" or "smc PENTAX 1:2.8 30mm", depending on its age, see www.bdimitrov.de/kmp/. It has a reputation for high optical quality, but I've never had one so I can't comment from personal experience. The price of $300(US) is about what you'd pay for one in mint condition on eBay, at least it was last summer; prices have been rising steadily since then. You can get more info on sale prices at my web site (not updated for a while, but will be soon...)
Jim www.jcolwell.ca
