Nikon's budget enlarging lens — the EL-Nikkor 50mm f/4 N at the slower specification.
A slower-aperture counterpart to the f/2.8 variant, the EL Nikkor 50mm f/4 N was positioned as a cost-effective entry into Nikon's multi-coated enlarging lens range. The f/4 maximum aperture is less convenient for focusing but the optical formula delivers the characteristic EL Nikkor sharpness across the 35mm frame.
50mm focal length, f/4 maximum aperture, NIC multi-coating, M39 thread mount, optimised for 35mm negatives.
The f/4 maximum aperture makes focusing in dim projected light slightly more difficult than the f/2.8 version. For critical darkroom work the f/2.8 N is preferable; this lens represents good value where cost is a priority and focusing convenience is not critical.
Inspect elements for fungus, haze, and coating condition. Aperture blades should be dry and clean. Check M39 thread engagement.