Nikon's Nikkor 50mm f/2 is not a very popular lens today, for the most part because there are affordable faster alternatives in the Nikon line-up. This makes that the 50mm f/2 often can be had for peanuts, which is a good thing because it delivers very good picture quality. I've used this lens quite a lot on a D80 for panoramic photography (stitching).
This lens is the Ai-version (3736297), which also is the last version produced by Nikon.
Aperture range: f/2-f/16
Minimum distance focussing: 0.45m
Aperture blades: 6
You can take a look at its dedicated gallery on my website.