Re: I suspect the original art pigments along with the 1Ds Mark II sensor is part of the issue. What do you think?

Hello Barry: If the problem, as I can see, is the surplus of cyan by the light through the polarized filters and in lens polarization, InCamera will do better with spectral measurement of light source only in combination with ColorChecker SG. And don't go "profile naked" if you have the spectral data of SG and use the build in small ColorChecker use DNG Profile Editor, or the entire SG and ACR Calibrator Script. Don't know if ArgyllCMS by itself or Jose Pereira's Rough Profiler make use of spectral measurement of light source. Let me insist in a better grade polarizer or the elimination of cross or single polarization in the workflow. ACR Calibrator Script will show you the numbers. Jose Bueno