DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
texinwien Veteran Member • Posts: 3,326
Re: DxOMark's measured ISOs vs. manufacturer ISOs

Jeff Charles wrote:

texinwien wrote:

This is one reasonable way to compare noise between two cameras, by taking pictures of the same test scene, ensuring that both get the same exposure, using matching camera ISO settings (aka exposure indices).

By the "same exposure", I assume you mean the same aperture and shutter speed, or at least an equivalent combination, on each camera.

Almost. It is also possible, in a studio setting, to adjust the illuminance, which, if you will read up on the earlier discussions of this topic, DPReview sometimes does.

As long as scene illumination stays the same that's the essence of a valid test.


However, to complete the test, we have to equalize output brightness between the two images, either by adjusting camera ISOs, or more likely, by boosting the brightness of the darker image on the computer.

Again, DPReview has addressed this. Where necessary, they have adjusted the ACR brightness or exposure slider to equalize brightness.

It comes down to equivalent input (exposure) producing equivalent output (image brightness). Once we've done that, we can compare the two images for noise, etc.

That's correct, and that's what DPReview works hard to give us.

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