DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Jack Hogan Veteran Member • Posts: 6,982
Re: DxOMark's measured ISOs vs. manufacturer ISOs

Mjankor wrote:

Noise performance when in-camera ISO is chosen so that both *sensors/ADCs* will provide the same mean outputl when presented with the same Exposure

So, just to clarify, you think that for the same scene: OM-D f6.3, 1/800, ISO 3200 will give a similar result as G3, f6.3, 1/640, ISO 1600. If so, I refer you to my experiment above.

Not quite. If DxO's Ssat measurements are correct (no reason to doubt that they are not), the mean Raw value produced by a Middle-Gray tone illuminated by the same source at the same exposure should be about the same, within measurement error, when settings are:

EM5 f/6.3, 1/800 ISO 3200
G3 f/6.3 1/800* ISO 1600

Of course this says nothing about relative IQ. It simply allows you to compare SNR objectively and possibly begin to draw some conclusions off an image like the one in this post.

*You don't really thing the G3 is better than the EM5, do you? I'll take a look at your experiment.

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