On your camera, at what ISO does noise go from "not enough to care" to "noticeable"?

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CreeDo
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On your camera, at what ISO does noise go from "not enough to care" to "noticeable"?
2 weeks ago

I know, I know, "it depends". And I know most of us will try to minimize ISO.

But play along for a second... what's an amount of ISO that you're ALWAYS comfortable adding, because the noise is so minor you don't think there's any shot it would really hurt, even at 100%, even with large areas of black in the photo?

I'm curious how various cameras perform, is there some objective scientific (or not) testing someone has done to compare this? It seems like on some cameras, 6400 is about equivalent to 400 ISO on mine.

 CreeDo's gear list:CreeDo's gear list
Canon EOS 1200D Canon EF-S 60mm f/2.8 Macro USM Sigma 50mm F1.4 EX DG HSM Rokinon 14mm f/2.8 IF ED MC Canon EF-S 55-250mm f/4-5.6 IS STM +1 more
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