Beating Low Visibility - Underwater Photography with Mathieu Meur

Mathieu Meur is author of a number of books on underwater photography and will be conducting photography workshops as part of the 2011 Underwater Festival 2-11 September 2011.

Text and Images by Mathieu Meur

 Underwater conditions are not always ideal for underwater photography. This doesn't mean that you should leave your camera behind when faced with the prospects of low visibility. Some techniques can prove very efficient in such conditions.

Know the area

Being familiar with the dive site helps you understand which subjects to look out for, and where to look for them.

Go slow and open your eyes

Using filters and natural light can help in low visibility. Mathieu MeurMake sure to dive at a deliberately slow pace, so as not to miss any opportunities. Also, there's less chance that you'll scare your subjects this way.

Strobe placement

Angle your strobe(s) inward, aiming slightly behind your subject for macro. Move them back behind the housing and aim slightly outward for wide angle. This minimises backscatter.

Strobe placement and lens selection

Select lenses that focus close to the port, to reduce the amount of water between you and the subjects.

Get close

This is oft repeated under any conditions, but is vital when shooting in low visibility: get close!

Use large aperture, slow shutter speeds and high ISO

If shooting in manual mode, set a large aperture. This reduces the amount of strobe power required to light up your subject, which means less backscatter. Selecting a higher ISO also achieves the same result.

Make use of the vertical water column

 Vertical visibility is better than sideways visibility. Shooting up will make the water appear clearer than it actually is, as more light comes through.

Use Natural light and filters

Instead of using strobe(s), take natural light or filter shots instead. No backscatter guaranteed!

Photoshop to the rescue

Should the worst happen, it is relatively easy to remove some obvious spots of backscatter in Photoshop using the Healing Brush Tool. The Levels or Curves tools can also help balance foreground and background in case of problems due to poor conditions.  

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