a7S high ISO claim - - -over hyped or not ?

Started Jul 3, 2014 | Discussions thread
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andrewD2 Veteran Member • Posts: 8,640
Re: a7S high ISO claim - - -over hyped or not ?

Two words were in caps for clarity.
Their data for the 6D and 5DIII is presented as 13.1 stops, 12.7 stops so the accuracy of that data should be +/-0.05 of a stop. Since my comparative testing puts them between 2.5 to 3 stops apart for real world useable DR then the DXO numbers are highly misleading and quoted to an unrealistic degree of accuracy.
The comparative tests are simple to perform, I did mine side by side but its possible to standardise the test so you could compare them with a set of bracketed photographs when you don't have the camera to hand any more.
A tool like your excellent ISO comparison tool shows real world results, you can see camera A at ISO800 matches camera B at ISO3200 and can conclude the number of stops apart they are. A tool like that is what is required for seeing what real world DR differences look like.

Andrew

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