Understanding Histograms The Basics

I have divided the topic of histograms in two:

• The first part discusses the general concepts and how to apply them underwater.

• The second part looks at current developments and ideas on the way in which histogram displays should be interpreted.

If you are already familiar with the concept of histograms, then please turn to page 116 for the current views. However, if histograms are new to you, then please read on.

I firmly believe and advise that we use our in-camera histograms whenever possible underwater — at the time of shooting. For starters, we have a limited amount of time underwater. We may not be able to return to the same location and shoot a subject day after day. We contend with the challenges of water visibility, currents, tides, depth, etc. and we don't have the luxury of our topside colleagues to hang around all day waiting for the right light to appear.

Scuba diving is a hazardous sport in itself and we need all the help we can get from our SLR in producing great pictures. Both the histogram and the highlight feature will provide good information, and I advise you take every opportunity to use them whilst underwater.

The histogram feature is the most effective way of quickly seeing if a shot is under- or overexposed. If you've yet to find this feature, it's simple to access when reviewing shots — just refer to your instruction manual.

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