Originally posted by jsherman999 Yes, but my question was more specific about what it actually measures, not what it (maybe) corresponds to. I don't think I've actually seen a breakdown of what goes into that number, not even a simplified criteria weighting. (unless I missed it.)
Originally posted by rawr DXO have reams and reams of material on the dxomark.com websitte that explains their methodology and what all the numbers mean.
DxO suggests that their overall score is a weighted sum of their three single scores (minus offset), where the sports-score must be used to the Log_2. The weights are such that an increase in 5 correspond to 1/3 stop. So, Overall score/15 is an overall EV score which you could call overall sensitivity score.
However, the individual weights
are not published and the arithmetic average formula isn't published either (e.g., they could use a weighted geometric mean). The weights are not simple, as far as I could find out.
I tried to reverse engineer the weights which means to solve a linear equation for the arithmetic average formula. My result hasn't been conclusive yet. I expected to find a relatively simple formula but didn't yet. All I can say is that the (logarithmic) sports score has a relatively high weight in comparison to the other two.
With all the information on DxO sites, I find it a bit strange that the overall score isn't made transparent. This, together with the fact that the sports score is based on the 30 dB SNR which is a bit high, let me to ignore the overall score. As far as possible. Hard to do if everybody else is citing it of course