High ISO does NOT cause NOISE! (but f/Stop & Shutter do!)

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First, Tony Northrup performs a series of experiments where he varies each of the three camera settings while keeping the other two settings locked: ISO, aperture, and shutter speed. As he proves, the only setting that does NOT cause high noise is high ISO - in fact, on many cameras, high ISO actually creates lower noise... but in most situations, varying the ISO makes no difference whatsoever. For more information, visit http://sdp.io/fake

Tony then presents an entirely new way to think about ISO. Instead of thinking of it as a camera control, think of it as a measurement of noise. It's more like a speedometer than an accelerator; if you're experiencing high noise, don't reduce your ISO. Instead, find ways to get more light to your sensor by using a longer shutter speed, a lower f/stop number, a faster lens, turning the lights up, or adding a flash.

For tips on reducing noise by using a longer shutter speed, check out the Rule of Doubles: http://sdp.io/double