While we are waiting for the experts, my understanding is the the Pentax-K mount has stayed standard mechanically since the K1000 in the 70s. So the lenses I bought then for my KX should fit on a modern Pentax and perform satisfactorily, as far as aperture operation goes. However, all the mod cons like autofocus etc. won't be available, of course. Plus, of course, the effective focal length changes as per the ratio of CCD size relative to 35mm film. While I've been pondering whether to buy a K100D body, I notice the K200D is out. While I ponder that one and save my pennies, it will probably be superceded as well!
