Originally posted by excanonfd That's an unusual situation, I didn't think it was possible to take the lens off separately from the adapter when the lens is mounted on the camera.
Let's reconstruct your problem; how do you normally use your Adaptall-2 lenses (mount and dismount onto the camera and swapping the adapter between lenses)? Detail it as much as you can.
It is possible to remove the lens from the adapter while still attached to the camera, but not usually necessary. Just move the aperture ring to the widest setting, push the chrome lever and rotate.
An Adaptal-2 lens with PKA adapter should mount/dismount the same as any other A-contact mount lens. There are no "gotchas" or special hazards. Ditto for the PK adapter. Simply press the lens release on the body and rotate counter-clockwise. Looking at mine as I type this, I don't see any opportunity for jam unless the mount had been modified at some time in the past.
Steve
(BTW, we are talking about the PKA mount and not the Ricoh P version adapter, are we not?)