More sort of aren't, really. The dealer finally got a set in today, and the outside of the box said "Pentax (AF)". Inside was a note saying "Note: use manual focus mode".
The tubes don't have the driveshaft needed for the camera to move the lens, so autofocus just whirs until it concludes something is wrong. In manual focus mode, you still get a beep when focus matches. I declined to purchase, on the grounds they didn't do anything that a plain set of K-mount tubes couldn't. OK, you get to have lens info embedded in the pictures, but that isn't worth the money. -- PDML means I get more e-mail than spam!
