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

Started Jul 3, 2014 | Discussions thread
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Re: a7S high ISO claim - - -over hyped or not ?
In reply to Rishi Sanyal, Jul 8, 2014

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.


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