Most of my diving is drift diving. While being picked up, I sometimes entertain myself by shooting the dive boat with a wide angle lens and dome port. What I'm trying for are some good/fun over under shots and some eye candy for the boat operators and staff.
Most of my shots don't turn out to be over under shots. However I have a lot of fun taking them and sharing them.
I do the same...on the last trip I started taping over my holes and then filled em and kept the water from coming out...works pretty well...
I been trying to take pics like that as well but for some reason the water doesn't bead off my dome port. Until after I polished it again and applied Rain-X and it does now.