Nikkors on Pentax ...
Having found a great thread on a forum about mounting vintage Nikkor lenses on Pentax, i managed to get a Micro Nikkor 55 f/3.5 for about 35$. Exactly as shown in the forum, the lenses mounted quite well on my K10D (you can see in a previous post the picture of a ring shot with this lens). It is really sharp and i got infinity focus, thanks to the greater depth of camera body required by Nikkor lenses.
Nevertheless, it didn't lock in, hence the need for an adapter, to allow going out "safely" - i.e. without loosing the lens while focusing or stoping down.
Snooping on eBay, i found a Nikkor to M42 adapter from a well known asian seller (i must confess he is my first source of M42 to Pentax adapters, either flanged or not), and, since it was really cheaper than other branded adapters, i decided to give it a try. So, i bought one from Roxsen, the only eBay seller offering them.
The adapter, shown in the picture below, comes in a plastic bag, without instruction, but they were not really required. The Nikkor lens locks in as on a Nikon body, and the adapter perfectly fits my M42 to Pentax adapter, so that now i can go out doing some macro shots with this lens.
The bad news: i have lost infinity focus, since the Nikkor adapter moves the lens too far from the focal plane, but, who knows, maybe the next generation will be thinner (i think 1mm will be good enough) ...
Now going to find a way to replace the Nikkor mount on the lens with a flanged Pentax K adapter ...
P.S.: For the chronicle, the picture has been taken with a CZJ Flektogon 35 and the camera flash.