ISO ‘Invariance’


JISOInvariance4Huh? What’s that? Never heard of it? That’s okay. First, let me say right here, that this is not an easy topic to explain but at the same time, it is important. Some cameras today are ISO Invariant or close to ISO Invariant. So what does that mean?

Note:
1) In trying to over-simplify things, some of the explanations may not be 100% technically correct.

2) Pictures must be shot in Raw format.

Putting it very simply, it means that the ISO setting on your ISO Invariant camera is not important.

We all know what happens when we try to ‘open up’ shadow areas in postprocessing an ISO Invariant camera, you can open up the shadows and still have an image that does not show any objectionable noise.

So, how does this help?
Consider a scene that is very dark. Generally, we would increase the ISO but that always results in a noisy image – the higher the ISO, greater the noise. So, let’s say that a dark scene demands…

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