If you were close enough, the water was clear and it was the right subject the lens could do a good job. If I were shooting close shots of corals, fish in clear water it might be fine, would love to try it out and shoot it side by side in our water down here in good and poor visibility. This would tell the down and dirty of how good it really is.
But we do need the widest angle for UW for almost everything except close up work. My preference is 120 degrees which gives us the chance to get closer to our subject underwater and get sharper, more color saturated imaging.
Shooting the 510 ft. Spiegel Grove shipwreck next week and I'm using the widest angle lens I can put on EPIC. Will let you know how it goes. Maybe post some shots, want to test out the Sigma 8/15mm lens. Might be good for that. We will see.
I'm still mad that it's not me getting to film the NEEMO project at Aquarius, was hard passing that one up. But at least I'll get to see the footage. Enjoy my friend.
Come by after you are done, I'd be happy to view the footage with you here. I so wanted to do that one. How cool that will be.