Hi Guys.. I have a chance this tuesday to go out to sea for a dolphin shoot, its 20 euros for a two hour trip. I'm not sure if I know enough to be able to take shots of dolphins or if I have the right lens even.. my lens being. Canon 15-85, Sigma 10-20, or Sigma 30 mm prime. I dont think the 30mm prime would be any good but the 10-20 wide angle might. Anyone know about this type of shot.. I would like to go but not much point if the gear I have is not up too it. Any thoughts.