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Sounds like I could be talking to a diver :-) I can't disagree with what you are saying, but for me, in most instances it does not apply as you are talking far more about taking available light pictures. These are the sort of wide angle shots of large objects (be it wrecks or fish) that are taken in crystal clear water. Last weekend we had good viz for Wales, 4 to 5 metres, The south coast this year is even worse, and in these conditions macro is the name of the game and the subjects are within the range of the strobes so the different channels are not that far apart in exposure requirements. If you are interested you can see some of my pictures at The Rapid Bay and Poor Knights Islands might possibly have benefited from filters, but I don't think the difference even there would have been that great.