Originally posted by Adam The short answer is no. Better to just get a manual Pentax lens
The long answer is that you can use the lens via an adapter that acts as a teleconverter, but this will negatively impact the image quality and shrink your field of view. A
mount modification will allow you to mount the Nikon lens directly, but you won't be able to focus to infinity. Older manual focus lenses can be mounted in a makeshift manner without a mount modification, but you still won't get infinity focus.
Since the mount is slightly shorter on Pentax, you should actually get infinity focus slightly early rather than not at all. I can verify this today with a non-ai 50mm.
Also the adaptist mount is only available for weather resistant DSLR bodies, the non-wr version is discontinued. Even that non-wr version never claimed to work with the k1000 or any film body.
Lastly, they claim that Nikon should give infinity focus on their mount but possibly earlier than infinity is marked. They offer shims to help make the lens more secure on their mount.