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ISO Data-Can I Trust My Camera's ISO Setting?

Started Jun 17, 2014 | Discussions thread
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ISO Data-Can I Trust My Camera's ISO Setting?
Jun 17, 2014

Over the years I have been using photo comparison sites like Imaging Resource and DPReview to compare cameras to determine which to purchase.  I have often wondered how accurate the ISO comparisons are.  I went to DXOMark to get their measured data for cameras I own and graphed it (below).  If I can trust the DXOMark data as being the actual ISOs rather than camera settings then I have to conclude the following:

1.  All camera ISO settings are high relative to their actual settings;

2.  The Olympus OMD EM5 is the most inaccurate (by about a factor of 2) and I should compare ISO 3200 for Olympus to ISO 1600 for all others.

I would like to know if my assumptions and conclusions are accurate.

DXOMark ISO Measured Data

 4thnebula's gear list:4thnebula's gear list
Canon EOS 70D Sony a6000 Sony E 35mm F1.8 OSS Canon EF 35mm f/2 IS USM Olympus PEN E-PL5 +13 more
Olympus OM-D E-M5
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