Nikon's common standard prime — the manual-focus Nikkor-H Auto 50mm f/2 for the F mount, double-Gauss.
The Nikkor-H Auto 50mm f/2 is a standard prime for the Nikon F system, introduced in the late 1960s. The H code denotes its element count, and it was one of the common kit standards supplied with early F and Nikkormat bodies. It gave a natural field of view and a moderate fast aperture at an accessible price.
This is a manual-focus Nikon F lens with a maximum aperture of f/2 and a fixed 50mm focal length, using an automatic diaphragm for full-aperture viewing. It is a double-Gauss standard design operating with normal reflex viewing. Only the verified focal, aperture and mount are stated; element counts, filter thread and weight are omitted to stay accurate.
The double-Gauss layout gives sharp central rendering that improves across the frame on stopping down, with pleasant out-of-focus rendering typical of a fast fifty. It suits portraits, street and general everyday photography with a natural perspective. Wide open it is a touch soft at the edges, cleaning up by f/4.
On the used market the Nikkor-H 50mm f/2 is very common and inexpensive, an easy first vintage Nikkor. Inspect the elements for haze and fungus, check coatings for cleaning marks, confirm the automatic diaphragm closes cleanly, and test focus for smooth damping. It adapts readily to mirrorless and remains a light, dependable standard lens.