F's are classic no-nonsense/no-distraction. F2s are pretty much the same, but nicer advance feel and modern flip-back. F3 gets you aperture priority. I love 'em all.

My regular user (6422xxx serial, mfg. 1960), F + Nikkor-N Auto 35/1.4:




Wife, same camera/lens, Neopan 1600, XTOL 1+1: