DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
edhannon Senior Member • Posts: 1,761
Re: DxOMark's measured ISOs vs. manufacturer ISOs

Gordon, not sure I see the usefullness of ISO rating, either for comparison between cameras or use in a camera I use.

IMHO better measures are the number of stops saturation is above middle grey meter reaading and the number of stops a SNR of 0 is below meter reading.

That gives the useable dynamic range and whether the camera under/over exposes.

For day to day use those numbers allow you to adjusrt exposure for difficult subject brightness ranges.

One complication is that the saturation number varies based on quality of light (sunny, cloudy, shade, tungsten) and type of lens (new Pentax, M42, other manufactures).


Ed Hannon


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