Upload & Sell: On
Well, trying to add to the suggestions:
- Get a 16mm/2.8 or /3.5 (or Sigma 15/2.8) fisheye and de-fish it a bit
- Though not a prime, the 18-35/3.5-4.5 Nikon is light and fairly compact, though the corners, unless stopped way down are not the best, though I've seen some nice images taken by it.
- 18/3.5 AI - Same as the zoom, but smaller
If it were me, I'd get one of the fisheyes and the 17/3.5 Tokina - the corners of the Tokina never get sharp, but you can crop them out a bit to get to 18mm-ish if you like. They are not that rare and do come up for sale every so often.