Pushed ISO: Let's make it clearFriday February 04 2011 Sensor Insight
RAW ISO values: The fundamental basis for accurate comparisons
A fair way to compare sensors is to assure that the shooting conditions are the same (same scene illumination, same exposure time and same aperture) and that the exposure of the output image is also the same. If these factors are the same, this will mean that the ISO sensitivity is the same at RAW level.
Thus when DxO Labs measures the performance of a sensor, we always link measurement results with exposure and then to real sensor ISO sensitivity.