A recent article posted here appears to assume that the purpose of calibrating ACR, (and by extension, Lightroom), using scripts such as the Thomas Fors script, is to cater for differences between cameras of the same model. I disagree!
The article said "they assume that the camera that was used to create the raw processor's profile and your particular camera of the same model have the exact same colour characteristics.... Or, it might be such that the generic profiling done by Phase One, Adobe, or someone else varies enough from what your particular camera does so as to make the creation of a custom profile (or as will be seen, an edited version of that profile) worth having".http://www.luminous-landscape.com/reviews/...ib-profil.shtml
I believe that the primary purpose of calibrating ACR or Lightroom using such a script is that the default Adobe method of calibration gives results that are unacceptable to many people, while the use of such a script gives results that many of those people prefer. To be very simplistic indeed, these scripts correct the Adobe tendency to give reds that are too orange, and grass that is too yellow.
Have a look at the many results of using such scripts for many camera models that have been published in various forums. They nearly always have a significantly negative Red Hue, and a significantly positive Red Saturation. (The values in the article are respectively: -9; 20). This tendency is obviously systematic, and not to do with within-model variations which would give values either way. I suspect that using such a script on the ACTUAL cameras that Adobe used originally would also give such results!
Here are some results that have been published in various forums:
D200: Red Hue: -24; Red Saturation: 42
D2X: Red Hue: -20; Red Saturation: +20
K100D: Red Hue -27; Red Saturation 40
K10D: Red hue: -13; Red sat: 7 (mine)
*istD: Red Hue: -24; Red Saturation: 27 (mine)
*istDS: Red hue: -26; Red Sat: +35
LX1: red hue -20; red saturation +42
LX1: Red hue: -26; Red sat: +19
A2: Red hue: -26; Red sat: 0
G3: Red hue: -1; Red sat: 20
300D: Red hue: -5; Red sat: 20
20D: Red hue: -9; Red sat: 9
10D: Red hue: -5; Red sat: 30
5D: Red hue: -5; Red sat: 11
5D: Red hue: -11; Red sat: 4
These are not results from anti-Adobe people, or people with no knowledge of colour management. These are typically results from people who own a GretagMacbeth ColorChecker, who care enough about their colour balance to use the ColorChecker and a suitable script to try to get things right, and who then share their results so that others can benefit. We don't have all the answers, but surely we can raise serious questions!