Originally Posted by K10D Preview
First Pentax DSLR to be compatible with planned introduction of supersonic motor-driven lenses – but these new lenses won't be here until next year and we understand they won't work on older Pentax SLRs, including the K100D
Unfortunately, it looks like the new lenses will not operate on cameras released prior to the K10D.
According to yesterdays post by a Pentax Europe product manager on a German forum
, the supersonic lenses will operate on older bodies.