DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
olliess Senior Member • Posts: 1,349
Re: DxOMark's measured ISOs vs. manufacturer ISOs

texinwien wrote:

olliess wrote:

...From the EXIF data it looks as if both shots were taken with the same 50 mm Olympus lens at f/6.3, but the OM-D shot was exposed at 1/800 while the G3 shot was exposed at 1/1300, which is about +2/3 stops more exposure for the OM-D. This would agree with the subjective differences in brightness (and suggest that you would need to dial in +2/3 stop on the G3 to make the shutter speeds match). But what good is this as a "comparison" of images at fixed ISO, e.g., 3200?

Although you would think that to be the case, DPReview has addressed this in great detail and with absolute certainty - the EXIFs on these shots cannot be used to determine relative exposure levels, due to DPReview's testing regime.

So what can we determine from this comparison, if anything?

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