Originally posted by martin s I just purchased a K10D, 21mm, and 40mm pancake lenses. The lens seem to both fit very tightly as I am mounting them. I cleaned the camera, and lens mounts, but no improvement. Is this typical??? Please advise.
I've noticed many lenses fit very tightly on the K10D. If you're overly concerned about it, go to Radio Shack (or other electronics store) and purchase a small can of lubricant designed for electrical contact switches (often simply called "contact spray"). Put a tiny amount on a Q-tip and apply very sparingly (barely visible) along the surface and threads of the mount. Your lenses will then mount much easier afterwards. By the way, this is exactly what Pentax would do if you sent it in for repair complaining about tight fiting lenses.
Do not use any other form of lubricant (WD-40, oils, etc) in this area since they might harm the mount's electrical connections or attract unwanted, abrasive, dirt and dust. In a few months, your lenses will fit much better on their own and you can wipe off any lubricant remaining on the mount. In the meantime, keep your fingers off the mount so you don't spread the lubricant elsewhere on your equipment (once dry, it's not going to spread much anyway).
stewart