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

Started Jun 17, 2014 | Discussions thread
Flat view
4thnebula Senior Member • Posts: 2,154
ISO Data-Can I Trust My Camera's ISO Setting?

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
Sony a6000 Olympus M.Zuiko Digital 45mm F1.8 Sony E 35mm F1.8 OSS Canon EF 35mm F2 IS USM Olympus PEN E-PL5 +11 more
Olympus OM-D E-M5
If you believe there are incorrect tags, please send us this post using our feedback form.
Flat view
Post (hide subjects) Posted by
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark MMy threads
Color scheme? Blue / Yellow