Mike's Grayscale Calibration Notes:
Grayscale is decent, but not great, right out of the box in Natural mode. The higher IRE range is fine, but the lower range has too much red and blue. It calibrated fairly well (see graph), with Delta E of 2.2 or less for the 30-100 IRE range, increasing quite a bit to 8.2 at 20 IRE. The default gamma setting gave a good average gamma of 2.22.
The Quick Cal of Dynamic reduces the green that’s apparent in whites and the blue that shows up in the grays, but it ends up being only a few hundred lumens greater than the calibrated Natural mode, which at 2245 lumens should be enough for any viewing application.