One of the very cool features of the Sony NEX-5 is the "Sweep Panorama" mode, which allows you to stitch a panorama shot together in the camera. It is loads of fun to play with, both topside and underwater. Our friends from the DeepShots blog recently published a great sweep panorama shot using the Nauticam NA-NEX5. Note that they use the Sony fisheye adapter. I had found that the fisheye adapter didn't work well with the panorama mode on dry land, but they successfully used it underwater. Here's their take on it:
Sony NEX-5 Sweep Panorama - Underwater (click on the small image to see a larger one):
Read about it here:
Deepshots Blog Post about NEX-5 Sweep Panorama Underwater