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AndyT:Great stuff !!!!
I forget - which camera/lens are you using, especially for the Manta shots.
Also what was the viz ? (for the Mantas)
mjh:I am using a Nikon D200 in a Aquatica housing and using the 17-55mm for the Manta shots. We saw them twice in German Channel feeding; viz was about 50-60 feet but there was a lot of plankton in the water, so it is good news bad news. If I had it to do again I would try the magic filter and try to shoot natural light. The 12-24 would have worked also.
Viz on the trip really ranged from spot to spot, but in general it was very good 60-90 feet.