DxOMark's measured ISOs vs. manufacturer ISOs

Started Mar 13, 2013 | Discussions thread
Martin.au Forum Pro • Posts: 13,257
Re: DxOMark's measured ISOs vs. manufacturer ISOs

Jack Hogan wrote:

Mjankor wrote:

For approximately equal output image brightness the numbers would be

Buzzzz! Reread previous posts. Exposure is only loosely tied to brightness.

Personally I'd have thought the best way to check IQ of a camera against other cameras if you were concerned about ISO would be to shoot the same scene with both cameras with the same shutter speed, ISO and aperture and have a look at the resulting photos. Maybe I'm a bit old school that way.

Nobody's stopping you from doing that, in fact you can check DPR's 'comparometer' as per my previous post. Too bad that if one manufacturer calls ISO 400 what another calls ISO 1600 you'd be unknowingly coming to the completely wrong conclusion... alas, for some ignorance is bliss


I'd like you to explain this.

In my example the exposure will be the same, and the final image after raw conversion will be of similar brightness. How could someone come to the wrong conclusion?

Explain what we would expect to see, in your hypothetical ISO400/ISO1600 situation.

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