Nikon El-Nikkor Metal Body Nikkor 50mm f2.8 Enlarging Lens for 35mm
This is the standard modern enlarging lens for 35mm. The glass is great and the lens shows only light wear. This is the nice metal version.
The lens is in clean condition with very light wear. There are a few small marks on the front element but they will not affect your image quality. Otherwise the glass is clean. There is no lock nut. It takes a 39mm nut.