ISO invariance explained better – and why you don’t need to read this article

Below you can see the shot this came from
No, not the amazing Mystic Meg, but the amazing 16 meg ISO invariant sensor in a Fujifilm X-T1 camera. This was cropped from an underexposed image. You can see the original further down this article.
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There has been a lot of talk about ISO invariance of late, all of it sounding mighty complicated. Here’s a short simple explanation of what ISO invariance is, how it might effect the design of cameras in future and is this imperative information? (Standby to be disappointed on that last item) read