Nikon 18-70 or Sigma 15 mm FE

Hi,

I'm new with "DSLR-diving". I hve both these lenses and I am curious to know if anyone has ideas of wich lens to use primarily. Either the Nikon 18-70 (with zoom-facilities below surface) or the Sigma 15 mm Fisheye. I'm going to Sudan and will be taking pictures of wrecks, fishes and corals.

For wrecks and corals take the 15mm, for fishes the 18-70mm could work.. but later you´r going to realize than the pics you take with the 15mm are going to be sharper and better than the ones taked with the 18-70... So, If you can only house one of them, you should take the 15mm

I second this opinion