Nikon Nikkor 50mm f/2 Ai - Nikon F Mount

The Nikkor 50mm f/2 Ai is a standard manual focus prime lens, often praised for its high resolution and neutral colour rendition. With a six-element design, it offers a slightly slower maximum aperture than the f/1.4 and f/1.8 variants but is frequently cited for its superior sharpness across the frame and lower distortion. It is a robust, all-metal lens suitable for everyday photography. Prospective buyers should ensure the Ai indexing ring moves freely and that the aperture clicks are distinct. As these lenses are often decades old, internal dust is common, but SDS checks specifically for heavier issues like balsam separation or cleaning marks on the rear element. The focus damping should feel weighted rather than dry or gritty.