What an impressive sight.View attachment 223487View attachment 223488
Nikkor-O 2.1cm F4, Nikkor-UD 20/3.5, and Nikkor AF-D 20/2.8.
The 21 is a mirror up lens, useful on Film only- the rear element goes WAY back.
I put the Nikon 21 finder on the F2S. I would normally lock up the mirror to mount that lens. The 20/3.5 is fine with through the lens viewing.