A Nikon darkroom enlarging lens — not a camera lens, used for film printing in a darkroom.
The Nikon 80mm f/5.6 Enlarging Lens is a purpose-built optic from Nikon designed for photographic darkroom enlargers rather than for camera use. Enlarging lenses are optimised for flat-field reproduction at close distances, which is the opposite of camera lenses that are optimised for infinity-to-moderate distances.
The lens delivers an 80mm focal length at f/5.6 maximum aperture with a flat-field optical design optimised for repro work, an enlarger-standard mounting thread (typically 39mm or M42), and the precise correction required for sharp corner-to-corner reproduction when projecting film negatives onto photographic paper.
Enlarging lenses are occasionally repurposed by photographers for macro or repro photography on cameras, where their flat-field optimisation provides exceptional copy-stand sharpness at 1:1 and similar magnifications. The Nikon enlarging lens range is well-regarded for optical quality. For darkroom use, the 80mm focal length suits standard 35mm and medium format negative projection.
Verify the mounting thread size and confirm compatibility with the intended enlarger or adapter for camera use. Check aperture blade operation for smooth, clean stops. Inspect element surfaces for haze, fungal growth, or coating damage — common in stored darkroom equipment. Confirm the expected flat-field correction by testing with a copy stand and fine-detail original.