Dxomark "measured" ISO vs Manufacturer ISO

dennismullen wrote:

You keep posting the same thing over and over so I will repeat too.

The measured iso for manufacturers iso1600 is 913 for the A99 and 1264 for the A900. We are being tricked by comparing the A900s iso1600 to the A99s iso1600 which is in reality closer to iso800.

We judge noise by comparing cameras at the same manufacturers ISO setting. If the camera lowers the actual iso sensitivity setting for "iso1600" on the dial, the camera will lower the shutter speed for proper "exposure" and it will appear the "iso1600" picture has less noise than a different camera that is more honest.
The way I interpret it is you own an A900 and you would like better high ISO so you go online and compare pictures taken at iso1600 from both cameras and the A99 pictures have much less noise. Everyone cheers the improvement.

Cheers,

So you buy the A99 and take a lot of pictures at iso1600 and at first you are happy because they seem much cleaner then the A900 iso1600 pictures. But in the back of your mind something is bothering you because it seems you have to go to higher iso settings to keep the same shutter speed in similar light compared to the A900 counteracting the benefits. DxO shows why.

--
"Those who would sacrifice liberty for safety deserve neither liberty nor safety." - Ben Franklin.
You can see larger versions of my pictures at www.dennismullen.com.