Preventing Backscatter

Backscatter is the illumination of the particulate matter in the water between you and your subject. Underwater photography and backscatter are unfortunate bedfellows. While there are times that you will not be able to eliminate backscatter in your images, there are simple ways to minimize it, and in fact it is possible to prevent it altogether. Of course, when you are shooting in a situation with a lot of debris in the water, some backscatter is inevitable, but even with a moderate amount of particulate matter, you will eventually learn how to prevent it.

You can clearly see here all of the particulate matter being illuminated by the strobe. Backscatter is the nemisis of underwater photography. Particulate matter in the water is ever-present, but you can work around it to produce clean images.

 

Minimizing Backscatter Comes Down To Strobe Positioning

(see strobe positioning)

Positioning your strobes out to the side of your housing will eliminate the illumination of the particles between your housing and the subject. Many compact point and shoot cameras have short strobe arms that do not adequately position the strobe away from the camera and therefore backscatter is harder to minimize. This is one of the primary reasons why the internal flash on a compact camera is usually not an option for underwater photography. The closer the strobe to the camera, and the more parallel the angle, the more backscatter will appear in your images.

Sometimes backscatter will be present no matter how hard you try to avoid it. Unfortunately you won't always see minor backscatter in the LCD screen on the back of your camera while reviewing images underwater. A good piece of advice is to zoom in on your LCD screen and try to spot check and inspect your images before decising that you have the shot. In this instance the backscatter, while minor and easily removable in photoshop, was not discovered until it was too late to reshoot.

 

Other Tips For Preventing Backscatter