Originally Posted by
anrkitec
The older Pentax SMC-FA auto focus lenses for the PZ/SF series work on the newer digital bodies.
The older Pentax SMC manual focus lenses will fit as well.
Remember also that Tokina is now making Pentax's lenses so you shouldn't see any drop-off in quality from what you would expect with a Pentax AF lens by going with a less expensive Tokina.
As a Pentax K10D owner the older SMC manual focus lenses really don't work with the Pentax new K's The only aperture setting is wide open. I personally have Sigma Lenses. I love my K10D and the in body shake reduction is great (works with any lenses) With that said, I've recommened the Nikon D40's to a few new to DSLR who were on a budget. It's hard to beat the quality of Nikon lenses.