János, Tóth F. wrote:
Yes, the re-calibration bring the original X and Z coordinates closer to the first results. The black drift was bigger than the drift in the chroma. But the re-calibration didn't change the CCT, it monotonously increased during the full measurement set. (And I think the display was relatively stable after ~10 hours uptime.)
You have no way of knowing whether the display was stable or not.
I will be a full day job at the end: Two hours acclimatization, high setup times (mentioned in the i1Pro thread) and the need for the adaptive mode with higher integration times. And a lot of black/white drift compensation measures, simply because it's a very long measure set anyway. :)
That's one of the reasons people spend (a lot) more money on better instruments - it saves them time, and increases confidence. There is a saying - "you can't turn a sows ear into a silk purse", and the sort of instrument you are using simply isn't designed to be perfectly stable with regard to temperature. I don't think this is an impediment to their normal use though.
And it reminds me to another question: You say that the default mode may gives us more coherent results because the adaptive mode works with random integration times. Can't we use constant (but user defined and high) integration times?
No, because then the instrument sensor will get saturated on brighter patches (quite apart from enormously increasing the measurement time). Graeme Gill.