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Originally Posted by Shadowkiller
Below 5m red light is gone, so a flash is required. Most cameras have an internal flash, some housings will have diffusers for them. If you have an onboard flash then backscatter, that is reflected light from particles in the water, will be a problem. Unless you have 30m viz! The onboard flash can be manipulated by shielding it with a finger to get less light. But for serious photography a strobe is needed which is positioned so that its light will not reflect back into the camera lens from particles.
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What I took from this is that the cause of backscatter is the location of the flash. Correct? Thanks for the tips.
