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Backscatter takes the clarity and interest away from your underwater scene by clouding it with random light reflections throughout the picture.
Backscatter occurs when the flash reflects off particles or plankton in the water, creating the appearance of “dust” in the image. Even the clearest of water has particles not visible to the naked eye.
The best way to avoid backscatter is to use an external underwater flash like the UFL-1 or the UFL-2. For those of you using your on-camera flash this is a great way to get started, but when you are ready to add that first accessory to your underwater system make it an external strobe.
To eliminate backscatter you want to position your external flash away from the axis of the camera lens. To achieve this you also going to need to use a camera tray that has a flexible bracket to mount the underwater strobe. This will allow you to position your flash to light up your subject and not the body of water directly in front of the lens.