DSLRs today offer such impressive performance at high ISO values that a practical approach is simply to accept whatever noise is there, dealing with it in post-processing, just as one had to do with film. For many applications, that’s a perfectly reasonable approach.
Yet it’s still useful to understand the behavior of any particular camera, particularly helpful in considering what ISO to use and how to approach post-processing. And for photographers with specific applications (eg astrophotography, fine-art, sports), noise handling at specific ISOs can be a critical priority.
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