Dxomark "measured" ISO vs Manufacturer ISO

Started Jan 7, 2013 | Discussions thread
jonas ar
Regular MemberPosts: 266
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Re: The undisputed fact is ...
In reply to TrojMacReady, Jan 10, 2013

TrojMacReady wrote:


Visible image exposure will not be underexposed by the suggested amounts, as also explained by DXOMark in their X100 review for example:

"On the surface this is odd, but perfectly explainable:

What looks odd according to the reference is the following observation:​ a selected ISO 1600 corresponds to a simple ISO 1000. This measured ISO remains constant for selected ISOs 3200 and 6400.

So far as I know Bill Claff and Marianne Oelund have measured the use of variable analog gain in D800 and determined that  the gain is constant above ISO1250 or 2000 depending on the meaurements used. However, the DxO measured ISO vs manufactorer ISO is linear all the way to the highest ISO

Why does the curve not flatten?

Cheers,

Jonas

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