Thank you all of you.
I was using the correct 6" dome port for my Canon 17-85mm lens. The petals were set correctly but at 17mm I cannot avoid the dark spots. A bit better composition and a little cropping will sort this out. Not that I am making excuses but it was 06h30 and we had bad viz.
The pic with the Manta with the fish was taken on the fly and the resulting motion blur si what you see. Sharpening in PS didn't change that but it did improve the Manta a little. My techniques with PS are a little like a kid with a fresh pack of candy: Eat them all right now, get sick later. I need to spend a lot more time learning PS.
From what I pick up on the forums, the 10-22mm lens seems the way to go? Better get that 8" dome port. I am also shooting with only one DS-125 and intend getting another. No more happiness to the body from the wife...
Oh! By the way: the Manta shots were strobe free. We were cautioned not to use strobes at that reef by the resident DM so I had to settle with a 400ISO and a steady hand.
Edited by Milton, 27 May 2008 - 11:48 PM.