Nikon 50mm f/1.4 NIKKOR-S Auto Non AI Nippon Kogaku Japan Manual Focus Lens, Chrome Review

The Nikon 50mm f/1.4 NIKKOR-S Auto is a manual focus prime lens from Nikon's pre-AI era, produced by Nippon Kogaku Japan. This chrome-bodied 52mm filter thread lens represents classic Nikon glass from the 1960s and early 1970s. The Non AI designation means it lacks the Automatic Indexing ridge introduced in 1977, so it requires extra care when mounting to modern Nikon bodies to avoid damaging the metering coupling lever (or requires AI conversion, stopped-down metering, or use on bodies that accommodate Non AI lenses).

At this price point, the lens is sold in bargain and used condition grades through KEH, making it an affordable entry into vintage Nikon optics for shooters willing to work with its limitations. The f/1.4 maximum aperture offers solid low-light capability and shallow depth of field control, hallmarks of classic fast fifty designs. It's best suited for enthusiasts of legacy glass who own compatible film bodies or digital Nikons that safely accept Non AI lenses, and who are comfortable with fully manual operation.