Think about strobes for WA. The S2000 has a GN of about 20 and the YSD2 has a GN of 32. This sounds like a lot but in reality it is only one stop or so. NO strobes can light up a reef or a whale shark and any strobe can give you good CFWA stuff. WA photos are really about natural light and getting your composition correct.
For the s2000 with a GN of 20 (in air) or say 7 in water this means that
GN = Distance (meters) * f stop
so 7 = distance (meters) * 11 (for f/11) so we can light up something about 2 feet (0.63 meters) or so away
with the D2 and a water GN of 11 we can light up the same thing one meter away at f/11
so the D2 is only good for an additional foot of distance.
Hope this helps
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