DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Jack Hogan Veteran Member • Posts: 6,982
Good Show

tko wrote:

Suppose instead of ISO you have a knob labeled "noise" or "gain." How would you measure performance? You'd set a standard exposure, set the "gain" knob for the proper intensity (RAW file values), and measure the resulting noise.

Very well said. That's exactly what DxO ISO allows us to do: it tells us at what camera-specific value to set the "gain" (in-camera ISO) knob so that every camera receives the same 'proper intensity (Raw values)'.

Still I guess the current method works pretty well until you get the odd player out and everyone gets excited.

Yes. If everybody labelled their "gain" knob with the same SI units threads like this would not exist.

Jack

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tko
tko
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