[elliott]

It's physically possible to mount Nikon lenses on Pentax (or so I hear, at least for some lenses). And Nikon lenses have a longer flange focal distance, which means they should also focus to (past) infinity, as I understand it.

As I understand it, pre-AI lenses will mount without modification, AI lenses require modification, but no auto focus lenses can be mounted. Not really a solution, just a hack to use some old Nikkors that you may happen to get a good deal on.