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Given that I have a background in computer science and engineering, the concept of ISO and signal-to-noise ratio (SNR) in digital photography and video is a no-brainer for me. It all boils down to one simple idea: the higher the ISO, the more noise (or grain) you’ll get in an image. For those of you who are still fuzzy about how this works inside your camera, check out this video below for a better understanding. I’d like to add one more thing that the video Bennett didn’t mention: heat and pixel density also contribute to the SNR, but that’s probably another debate.
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