To use older Pentax lenses you have to set your camera to "allow aperture ring" in the menu settings.
I have done so, with the result that the kit lense (DA 16-45) lense work just like always. The KA lenses work as they should when i put the aperture ring on "A", and when i put them on a manually chosen aperture they work just as the pre-"A"-lenses.
Is there any advantage in setting the menu at "dont allow aperture ring"? Why does this option exist at all? What have I missed?