Originally posted by pjr thanks for the advice. How do lens changing works(M42 lenses). Can I leave teh adapter on teh camera and change lenses? or do I need to change adapter off the camera?
The adapter has a small pin mechanism that holds it in the k-mount. Some people buy adapters for each of their lenses and remove this pin so they can permanently mount the adapter to each screwmount lens, however for using a single adapter with multiple lenses yes, it will stay attached to the camera no problem. So you can just screw each lens on and the adapter will stay in place. And definitely spend the little bit extra for the official pentax adapter, well worth it!