Nikkor-S.C. 1:1.4 f=5cm "Sonnar-Typ" Rangefinder
99% of 50mm/f1.4 RF lenses are this type.
Nikkor-S Auto 50mm f/1.4 (SLR Lens/
This lens, although long in productions, has itsknown weaknesses !
Design is very close to the 1959'er Zeiss (Contarex 55/1.4) (Johannes Berger u. Günther Lange)!
1:1.4 f=50mm Rangefinder "Olympic" Planar-Typ
Similar design as (1959) CANON 50/1.4 with one more element.
Experts say the best Nikon 50/1.4 lens ever made.
Notable History and Design (The Thousand and One Nights, #77, by Haruo Sato)