Originally posted by Schuette I've tried with two AF lenses that normally auto focus fine. Neither is behaving how they normally do and all three work as normal on a K110D. I've tried gentley turning it both ways.
This isn't looking good is it.
No, it isn't looking good. You say the lenses are working fine on another camera so:
When you put a lens on the camera, one of your AF lenses, does the camera ask for a Focal length?
If not, Have you tried the AF button for Auto focus? Try exercising the AF/MF switch on the camera several times and make sure the screw drive actually protrudes from the lens mount when on AF.
Do you know what aperture the camera is actually shooting at (wide open or full stopped down)? Have you tried Manual mode to see if you can get it to change apertures?
If the lens has an aperture ring, take it off of A and set it to some aperture. Then activate the Optical Preview (pg 170 in the manual). It Should activate the aperture and stop your lens down to the set value and you'll see the viewfinder darken. If nothing happens, take the lens off and look inside the lens mount at the lever that moves the arm on the lens (for activating the aperture blades). I've read many times about a spring coming loose on that arm in different cameras.
Manual focus one can live with but if you cannot control the aperture, that's an entirely different story. You may now have a nice digital spotmatic. Get yourself some M42 lenses and an adapter. Repair costs for the K10d seem to typically outweigh the replacement value.