DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Martin.au
Martin.au Forum Pro • Posts: 13,255
Re: Well now, that was fast

Jack Hogan wrote:

Mjankor wrote:

Jack Hogan wrote: 1) In-camera ISO labelling is inconsistent from camera to camera and from manufacturer to manufacturer

I contest point 1). Citations or examples please. A stop or more please.

They are all over this site and the web. Look for them yourself, I am done helping you.

As for point 2.

"In fact, it is precisely the JPEG ISO value that all the manufacturers publish. They do so because JPEG (or any RGB) output is the visible output that photographers use. So when you select ISO 800 on your camera, you’ll have a JPEG ISO at 800, but the RAW ISO will be at (for instance) 550. The JPEG results are achieved by playing with the tone curve shape. This is absolutely legitimate: the ISO standard allows manufacturers to use this JPEG value. They are not cheating."

http://www.dxomark.com/index.php/Publications/DxOMark-Insights/Pushed-ISO-Let-s-make-it-clear/RAW-ISO-measures-are-inferior-to-manufacturer-ISOs-is-this-a-problem

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