ISO is an important aspect of digital photography to have an understanding of if you want to gain more control of your digital camera. Experiment with different settings and how they impact your images today – particularly learn more about Aperture and Shutter Speed which with ISO are a part of the Exposure Triangle. High ISO means high level of noise. And high noise in an image means more grainy looking picture with missing details. It eventually results in an image full of noise that is lacking sharpness and clarity. So select your ISO wisely and make sure it doesn't result in noise.
The ISO setting of your camera directly affects the noisiness in your pictures. A larger ISO allows you to use faster shutter speed and smaller aperture. The ideal ISO to use is 400 - 800 (it differs from situation to situation).
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