The Nikon Nikkor-S 50 mm f/ 1.4 non-Ai is a fast normal prime lens for Nikon F cameras.
The first 50/1.4 S model with the 7/5 optical scheme was released in 1962. It featured 6 aperture blades, a 6-digit serial number, and weighed 300 g (see photo). Since April, 1966 the lens had Nikon designation instead of Nippon Kogaku. It weighed 325 g. From 1973 to 1974 the lens came labeled Nikkor-SC. it featured multicoating, seven aperture blades, and 7-digit serial numbers. The K series was produced since August, 1974 to January, 1975. It completed the 50/1.4 model with the 7/5 optical scheme. This version had a larger angle of focusing ring rotation. The new K series, produced since January, 1976 to 1977, featured a different 7/6 optical scheme, a smaller weight (260 g) and length (39.5 mm). From the K series on and after Nikkor there was no letter S on the lens. This transitional series already resembled Ai, but operated as lenses of the previous series. (contributed by dv 25.03.2011)
Posted by: Nik_SSG Date of publication: 21.03.2011