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How to reduce noise at high ISO settings | Digital Camera World
Image copyright Ben Birchall
Shooting indoor sports action using a fast shutter speed, old, gloomy churches without flash or bright landscapes where you want to slow down the shutter speed to capture movement are just some of the many situations where you will need an extreme ISO to get better results.
ISO denotes how sensitive an image sensor is. Any change from the manufacturer’s native ISO (the lowest default, which produces the optimum image quality) will have some form of electrical signal modification that results in noise.
Most DSLRs have a native ISO of around 100 or 200; beyond that, at the extreme low end of the range, quality isn’t improved. However, some manufacturers offer lower ISO values in the menu, such as ISO 50. Others use a decimalised f-stop value to indicate when it falls below the native ISO.