Hi Michael
Next time when I have VT50 in my hands I will start with THX, following your recommendation and then I will calibrate ISF Day and Night and compare results.
Yesterday I calibrated ISF Day and Night and got great results, really great, not only on paper but on the picture.
I like AutoCal. It is not perfect, but when you are under 1.5% off error you can stop there. I am crazy about details so I adjusted grayscale and gamut manually to perfection.
What problems do you actually see with ISF calibration?
Regards