ISO 400
The ISO setting controls the camera's sensitivity to light. Use a lower ISO setting in brightly lit scenes, use a higher ISO setting for low-light scenes.
AUTO (default)—the camera automatically sets an ISO speed based on scene brightness. Ideal for general picture taking.
ISO 100—ideal for daylight pictures in bright sun, when fine detail is needed. Great for portraits or nature scenes.
ISO 200—ideal for cloudy, overcast days. Great when you need extra speed without sacrificing image quality.
ISO 400—ideal for dusk or night pictures when flash is prohibited; great for pictures at sporting events when you need to stop the action; and excellent for indoor shots, with or without flash.
jackdp said:What lighting does everyone use when photographing in reef tanks? I have a 175W 10K MH and 2 55W PC actinics. I've tried different lighting combinations but just wonder what anyone else's results have been. If I use all lights on the pics come out okay but a little blue. When just actinics are on the corals look great but the pics look VERY blue, I don't think the camera knows how to deal with all the blue light. Do you use the flash? Any filters on the lense? Just fishing more other people's ideas....