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Would it be fair to say that a digital camera is rather like a satellite dish? And the light which is being reflected by whatever it is you wish to take a photo of is the "signal" which you are trying pick up against the background noise created by the rest of the universe. And if you increase ISO setting it is equivalent to increasing the amplitude of your receiver. You have a stronger chance of receiving the signal, but you will also end up receiving more noise. Which can be filtered out, but with caveats.
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