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I am no expert so I can only state the obvious. First of all, great shots and thanks for sharing. Now I can only recommend that you zoom in a little to avoid getting the black edges (Vignetting). Also, always try to shoot looking up at your subject (I cannot do this and often it is the surroundings that limit that).
What camera sustem are you using?
hey steve, thanks for your comments! I quite forgot about the zooming in bit actually, but my zoom lever was a little faulty to begin with so the idea kinda got chucked at the back of my head.
will try to shoot upwards as much as the conditions allow. most of my macro subjects were so near the seabed that i was practically resting on the sand (of course with checking before I land).
I'm using an A640 housed in Ikelite, with either Inon macro or WA lens and a borrowed Z-240 strobe. My own strobe is a D2000S but it was a tad weak for WA.