The third of three videos in the series “Understanding Shutter Speed, Aperture and ISO” (you can watch part 1 on shutter speed here, and part 2 on the aperture here) discusses ISO - what it is, how it works, and what happens when you change your camera settings from a low ISO setting (50-100) to a mid-range ISO setting (400-800) to a high ISO setting (800 and beyond).

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Amy Renfrey writes a bi-weekly/occasional article for The Corner Blog. Amy is a digital photographer, a photography teacher, and author of the popular Digital Photography Success package as well as her ebook Powerful Landscape Photography. For more information, or to purchase her Photography Package, visit her site: Digital Photography Success and Powerful Landscape Photography. Amy also publishes a monthly photography ezine called Focus eMagazine which includes dozen of articles and tutorials, as well as hours of video each month. Click here to find out more and subscribe to Focus eMagazine.