MC> Are you shooting digital or film? If digital - do you have Auto White
MC> Balance on?
Thanks for the suggestion. I have had nothing but problems with AWB,
even on supposedly superb cameras like D2H's matrix colour meter. It
drove me nuts in postpro, because of tiny variations in otherwise
almost identical frames (sometimes just 1% different framing). Now I
shoot with presets or kelvin values (if the camera supports it). I
though it was the autocontrast causing the problem with Bush, but same
problem happened with Putin later in the evening, where I had
autocontrast turned off - perhaps the chameleons theory is right ;-)
MC> Even with the white balance locked to one setting, I do notice when I open
MC> RAW files that the tint setting varies - usually not by much, but 10 to 15
MC> points. Color temp seems to be consistent.
That is strange. Although it might be the exact same problem with
flickering lighting.
Good light!
fra