I am really confused. Some of the different responses:
It works on the K10D, but not others.
It works on all the current Pentax digital cameras.
And I have also read (can't remember where) that it uses the same contacts as SDM lenses, so can be used on any camera that supports SDM.
But on the pentax website it states:
Q: Are the Power Zoom functions available on certain PENTAX lenses supported with our DSLRs?
A: No.
Power Zoom and PENTAX DSLRs | Pentax Support
And from the specifications of the k-r (and k-x is the same):
SDM function: Yes
Power zoom function: n/a
Has anyone used the power zoom on a k-r (or k-x or k-7) and can you confirm that, contrary to the Pentax website, the power zoom can be used?
(I take it everyone agrees that the power zoom lenses can be used as standard zoom lenses on all the current cameras.)