Released in 1956, the Nikkor-N.C 50mm f1.1 is an ultra-fast lens designed for the Nikon S series. It features a 6-group, 9-element optical construction and accepts 62mm screw-in filters. Among all Nikkor lenses for still photography—including those for the F mount—this is the fastest lens ever produced.

This lens was Nippon Kogaku’s answer to the postwar race for ultra-fast optics, competing with the likes of the Zunow 50mm f1.1, Fujinon 50mm f1.2, Hexanon 60mm f1.2, and Canon 50mm f1.2.

This particular example is the internal bayonet version, also referred to internationally as the Internal Mount. Nikon transitioned to the external bayonet type in 1959. Only 835 units were ever produced for the Nikon S mount, combining both internal and external versions. Additionally, just 211 units were made for the Leica L mount.

At wide apertures, the lens produces a dreamy, soft rendering with glowing highlights. However, stopping down to around f1.3 results in a dramatic improvement in sharpness and overall image quality.

There are minor scuff marks on the mount and slight scratches near the red dot at the base of the mount, but overall, including the black paint, the lens is in very clean cosmetic condition.

It was fully overhauled in July 2025. The aperture ring, which often becomes stiff, now operates smoothly. Focus calibration was confirmed on a test Nikon S body, and rangefinder coupling works perfectly.

There is some balsam separation along the edge of the inner elements, a known issue with this lens model, but it should have minimal impact on actual photography. The glass is otherwise free from scratches or fungus, and for a Nikkor 50/1.1, it is in very clean condition.

Please note that when using a Nikon S to Leica M adapter or similar, the rear lens guard may interfere with the rangefinder cam, preventing accurate focusing. This lens is best enjoyed on Nikon S series bodies or mirrorless digital cameras.

A rare original front cap, 62mm screw-in L39 UV filter, and case are included.