Rainer,
I have been wondering if exposure makes a difference in the white files since the RAW data is linear (so long as no pixels are blown out). I saw in the article that they suggest to do the exposure in the range of -.8 to +.4 stops but sometimes this is inconvenient or not possible without changing the aperture settings. What problems do you encounter when the exposure of the white is over that - say +1.5?
Thanks,
Eric