DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
OP cptobvious Contributing Member • Posts: 816
Re: DxOMark's measured ISOs vs. manufacturer ISOs

Mjankor wrote:

Ok, you seem to be under the impression that DxO's ISO actually means something like the general definition of ISO.

So, two cameras, Camera A which measures DXO ISO of 200, at its claimed ISO 200, and Camera B, which measures DXO ISO 100 at its claimed ISO 200.

What do you think will happen will happen if both cameras photograph the same scene, same shutter speed, iso200, same fstop?

I don't take DxOMark's findings as gospel, but at least they've made an attempt at objective comparisons, something that other review sites have not come close to doing: http://www.dxomark.com/index.php/Publications/DxOMark-Insights/Detailed-computation-of-DxOMark-Sensor-normalization



To answer your question, Camera B will underexpose by 1 stop. There are a couple ways I think reviews could address this:

1. Show the side-by-side photos as-is with the uneven exposure.

2. Raise the ISO of Camera B to match the exposure of Camera A (or better, set both to a pre-determined reference exposure).

Either would be more informative than varying aperture or shutter speed.

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