Understanding your Underwater Camera Settings

I often see people asking about settings for their underwater camera. What settings for low light? What settings for wide-angle photography? Macro photography? Etc.

F5.6, 1/25th, ISO 250

People seem to like to memorize settings, and use them all the time. I can understand that, sometimes there's so many other things to worry about. Strobes, buoyancy, air, no deco time, finding subjects.

But I hope I can convince you to take a different route. Instead of memorizing settings, try to understand your settings. Then you can adjust to different scenarios.

Let's look at the big three, F-stops, Shutter speed, and ISO.