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I'm not sure the ISO is greatly relevant, since it doesn't mean you collect any more information/signal. Taking a photo at a lower ISO might look darker, but you can just adjust later in software to achieve the same effect as the higher ISO - the amount of data is the same for the same exposure. At least this seems to be the case once you get past the really low ISO figures. ISO might be slightly more relevant if you are shooting JPEGs though due to lower bit depth than RAW.
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