PatW
Contributor
Like Gilligan, I would greatly recommend using RAW. RAW allows you to adjust white balance without penalty in post processing. RAW also allows you to reclaim for more from high lights and shadows than JPG. So if you photo or a critical part of it is over exposed or underexposed, you have a far better chance getting a good result when you shoot with RAW. If you are not pretty much spot on, JPEG will not work. Also, exposure is far more challenging underwater than topside.
I would also recommend going full manual. If you go with shutter priority, the camera will just choose the F stop it wants and it might not work. If you choose the F stop, the camera will often pick a ridiculously slow shutter speed. Going full manual gives you far better control.
Also, follow Warmwater Wank's advice and get very familiar with your camera top side. I would suggest taking photos with it with the housing on. If possible, find a pool and do an underwater session on the bottom of the deep end. It will give you some appreciation for how big a change being underwater makes.
I would also recommend going full manual. If you go with shutter priority, the camera will just choose the F stop it wants and it might not work. If you choose the F stop, the camera will often pick a ridiculously slow shutter speed. Going full manual gives you far better control.
Also, follow Warmwater Wank's advice and get very familiar with your camera top side. I would suggest taking photos with it with the housing on. If possible, find a pool and do an underwater session on the bottom of the deep end. It will give you some appreciation for how big a change being underwater makes.