This is my first test with Sigma 12-24mm f/4.5-5.6 EX DG ASP HSM and Nikon F80. I used my Aquatica Housing adapted to F80 with an 8" dome port and 2 extension rings (40mm). I used minimum aperture of 8. I scanned the negative superia 100 with a Dimage Scan Dual Scanner. Some color balance, sharpness and contrast were necessary to digitalize these images. I´m very happy with my first results. In the near future I will shoot with chrome and digital (D100) and I hope I can have even better results.
Flare is the worst problem of this lens like any zoom wide angle. We must pay attention in situations where flare occurs. Other problem is some vigneting visible under f/stop 8. This last problem doesn’t occurs on the cropped sensor of digital

Aperture 8 - Sigma 12-24mm at 24 - 2 strobes YS350 at 1/4

Aperture 8 - Sigma 12-24mm at 24mm - 2 strobes YS350 at 1/4

aperture 11 - Sigma 12-24mm at 12mm - no strobe

aperture 8 - Sigma 12-24mm at 12mm - 2 strobes YS350 at 1/4