The underwater bouyancy of a small digital camera like that will be less than +/- 1 lb. Effectively minimal. Worst case you may put an extra 1 lb in your belt. The important thing is to make darn sure that camera is tethered to you in some fashion that will not release by accident. Whether a camera is either positive, neutral, or negative is really a matter of preference. There are various reasons for prefering one of the three. Some people like positive, because if they loose the camera, it won't drop into the abyss and can be recovered at the surface. On the other hand some people like it negative because if they loose it, it will be right beneath them and not floating away on the surface somewhere. My solution is just to not loose it. I use a retractable tether. Just dive it as is and see what you think. Enjoy taking pictures...
