I should have adjusted my center of focus, these polyps are just so tiny and even with the live view and digital zoom preview.hmm could it be that the point of sharpness is not perfectly in the centre of the coral, but rather slightly out from that point?
Great shooting in both cases, definatly not easy considering that you don't have flash (if I remember right you don't use flash) and are using abient light - even if you have nifty lighting setups.