D4 vs 1Dx (Imaging Resource), RAW, ACR, 6400-12800

Started Sep 4, 2012 | Discussions thread
OP rhlpetrus Forum Pro • Posts: 25,165
Re: It should be about shutter speed, not ISO

bobn2 wrote:

The DxO 'ISO' ratings have very little to do with 'ISO'. What they are is the sensors saturation exposure, expressed as an ISO rating. If you use an ISO based method for photography, the exposure you get is set by the calibration of the meter at that ISO, not be the sensor's saturation capacity. So, even if two cameras have radically different DxO 'ISO' ratings, if their meters are calibrated the same, they'll give the same exposure.

Depending on the use, if ones exposes via histograms, DxO has a meaning. But I think people are reading or requiring too much. These samples are just indicators of performance. These two cameras look close. They'll probably perform similarly in the field re low light. The gap in favor of Nikon has been almost closed (the Nikon samples look a little cleaner still).
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