ferider
Veteran
I hope you have deeeeep pockets, there are only a couple of hundred of the Nikkor 21mm around and collectors hold most of them. There simply isn't enough out there for the whole collector society let alone users.
They sell in the $6000-$10,000 range!!!
The F version is much more common.
Kiu
Regarding the first F version, Kiu, like this one for instance: 170114941925. Is it optically identical to the RF version and can a normal adapter be used (for example the Novoflex one http://www.amazon.com/Novoflex-Adapter-Mount-Nikon-Lenses/dp/B0002SSFIY) ?
Thanks,
Roland.