1)get a macro lens
2)use a uv filter on the lens (they are dirt cheap)
3)to turn of flash just go into manual or p mode
4)also autofocus may not be the best option try manual focus
5)having a stand will help a lot
6)try taking pictures from different angles (this can help you a lot with certain corals or frags)
7)i have used a nikon d5100 and have managed to get some decent pictures out of it and i am sure you will too
8)persistence is the key here
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