Originally posted by beachgardener full manual is also ok with me, maybe I’ll buy myself a present
Why not? It may not have all the bells and whistles of the Pentax Auto Bellows (change orientation of camera independent of the bellows, moving front and back standards, reversible front standard, slide copier attachment). Even with the auto bellows you still have to shoot full manual as there are no linkages to the camera body. One advantage is the bellows has a DOF preview button that you can use with or without a mechanical cable release to stop-down the lens. Thus you can just set and forget your f-stop. And that's not that much of big deal since you normally shoot close to fully stopped down for best sharpness and DOF. Another big plus with the Pentax Auto Bellows is the built-in focus rail. The Pentax Aoto Bellows for K-mount will probably cost you 2-6x as much as the Fotodiox.
So along with the bellows you should look at focus rails, reverse K-mount adapters and step-up/down rings.