As a photographer - underwater or topside - there are 3 values that you need to concern yourself to properly expose an image: Aperture, ISO, and shutter speed. Today we’re going to talk about aperture. Aperture is the most complex of the three, and perhaps the most important to understand.

Learn about the aperture scale and what the numbers mean. And most importantly, Ikelite Photo Guru Steve Miller explains critical differences between selecting an aperture above water vs underwater.

[0:00] Introduction to Exposure Values
[0:27] What is the Aperture
[0:36] Understanding the Aperture f/number Scale
[1:18] The Effect of Aperture on Focus and Depth of Field
[2:00] Depth of Field in Underwater Photos
[3:05] Desirable Aperture Values for Underwater Photography
[3:38] Underwater Bokeh Effect
[4:18] Aperture Bracketing

Learn more about When to Change Aperture Underwater:
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Looking for more information on underwater photography? We have hundreds of pages of tutorials, cheat sheets, videos, and inspiration on our website in the Ikelite Photo School:
https://www.ikelite.com/pages/photo-s...

Ambassador Steve Miller has been a passionate teacher of underwater photography since 1980. In addition to creating aspirational photos as an ambassador, he leads the Ikelite Photo School, conducts equipment testing, contributes content and photography, represents us at dive shows and events, provides one-on-one photo advice to customers, and participates in product research and development. Steve also works as a Guest Experience Manager for the Wakatobi Dive Resort in Indonesia. In his "free" time he busies himself tweaking his very own Backyard Underwater Photo Studio which he's built for testing equipment and techniques.