Originally posted by jcool I have a k20d and hope this lens will work on my camera and not screw it up as well, ever since I read the one thread concerning the third party lens locking on to his camera I am really unsure of putting anything other than Pentax on my k20
It's the lenses with the Ricoh pin that does this.
I have a thread about this before and asked what it was (Ricoh pin) to look for 'coz I was also concerned about a certain lens locking on my DSLR.
Not too many replies but I found the answer myself by googling.
You can find the thread here too and look for "Ricoh pin".
It's also actually a pretty easy fix once you know what to look for and what to do.