Nikkor 28mm f/2 AI Lens c.1981

I bought this secondhand at perhaps a bit less than the going rate because of the damage to the filter mount. I have had worse: at least it remains possible to mount a filter or a screw-in hood to this one.
This lens dates from the pre-AF era. It remained in production from 1970-2005 but was not made in the volume that its f/2.8 companion was produced. Opinions differ over which is the better lens. Professionals often went for the f/2 on account of its faster speed and good image quality at all apertures. It was of course more expensive. Amateurs could not set its purchase off against tax.