The G16 can produce some absolutely stunning underwater video. The problem is that is has difficulty autofocusing when there is less than ideal contrast (like almost anytime you're shooting underwater!). The solution is simple: Don't use autofocus. Set up one of the user customizable settings (C1,C2) for video, including manual focus. I set the manual focus to be sharp from about 12 inches to infinity and programmed that setting in along with all the other parameters I wanted. Works great. In fact, I also programmed manual focus into the other customizable setting for shooting stills. That way, when something comes zooming past you can just whip the camera up and snap off a shot without having to wait for the camera to autofocus. When you have plenty of time, then you can use the other settings (M, P, Tv, etc). I also programmed the Shortcut (S) button for manual white balance. I think you'll find using manual focus for video will solve your problem, as I did. And again, if you program it into a customizable setting you never have to mess with it again. Good luck!