Just recently went shark diving off of Jupiter, FL. It was amazing to be that close to the sharks. I have done cage diving before but this experience was amazing. You are right there with the sharks. I used a 8-15mm Fisheye. I am not sure if I am big fan of the fisheye lens. Here are some pics from the trip:
More pics can be found here:
http://www.seansydnorphotography.com/p271756073
