DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Jack Hogan Veteran Member • Posts: 6,983
Re: DxOMark's measured ISOs vs. manufacturer ISOs

Mjankor wrote:

Nobody's stopping you from doing that, in fact you can check DPR's 'comparometer' as per my previous post. Too bad that if one manufacturer calls ISO 400 what another calls ISO 1600 you'd be unknowingly coming to the completely wrong conclusion... alas, for some ignorance is bliss


I'd like you to explain this.

Perhaps an example would help. Suppose one wanted to compare the noise performance of two different cameras in the kind of conditions that required ISO 200 in order to satisfy his artistic constraints for blown highlights, DOF and blur - and came across this comparison on a fictitious but nevertheless well respected site:

What erroneous conclusion would he reach?

PS Did I mention that the current standard basically allows manufacturers to label in-camera ISOs as they please? 400, 200, 100 or whatever they like? That's the EM5 at 25k, by the way, but I, the manufacturer, decided that today it felt more like 200  Clearer now?

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