Good shot Elbert!
I got tired of lugging 35 lbs. of camera equipment to the boat and there was never a dedicated rinse tank big enough. Then all these amateurs with little throw away cameras were getting shots as good as mine! sucxed!
I bought the little Cannon from Peter Jones and am learning to use it. Same rules apply,
1) Get Down
2) get Close
3) shoot up.
For turtles you know it helps to have a dive buddy who kinda corrals them towards you.
Keep up the good work.