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I use a Canon PowerShot G6. I shoot on a tripod. For corals I use "P" (though I think any non-auto setting will work), using a 2 second self-time delay, no flash, manual focus, F8, digital zoom on, ISO 100. If shooting fish, I use flash.
The biggest problem shooting with Canon cameras (and I understand this is common to all) is the tendency to add magenta/purple artifacts to images shot in daylight. Since aquarium light is like extreme daylight, the problem is magnified. I get around it by shooting with actinics off and using, whenever possible, just 10,000k bulbs. When I was shooting a lot of corals for sale, I put them in special small tanks I had set up especially for that purpose using only 10,000 t5 lights. When forced to shoot in my tank with metal halides, I sometimes cover over the top of the tank with layers of plastic eggcrate and sometimes newspaper to diffuse the light and eliminate hot spots.
See my list of photography tips for other suggestions and feel free to ask more questions. I also do a lot of color correction to reduce blues and exposure correction in Photoshop. If you have Photoshop and want tips, I'll be glad to help.
Suzanne
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