So I have uploaded the samples of colour shifts. There are two pairs: all are in manual white balance, manual (same in the pair) exposure, no flash used, all taken at the same second after each other (at 3 fps "motodrive" speed). Oh, forgot to add, shutter speed was around 1/500 for the first two, and 1/320 for the second two.
http://3web.dkm.cz/fotof/temp/lighttest1.jpg http://3web.dkm.cz/fotof/temp/lighttest2.jpg This pair has got the contrast setting on AUTO, which might be the culprit (but in other daylight shooting, AUTO contrast performed very well and consistently) http://3web.dkm.cz/fotof/temp/lighttest3.jpg http://3web.dkm.cz/fotof/temp/lighttest4.jpg These two are on full manual, with contrast set with custom curve uploaded to the camera (same curve in both shots). First pair are daylight, but with heavy floodlights fill from front. Second pair is during the night, lit by two heavy floodlights and some ambient light from streetlamps. The floodlighs were aprox. daylight, as the cloudy WB turned them into nice golden light. In the first two, I thought it was becuase of the AUTO contrast setting. But the second two confirmed (with contrast on manual) that something else is taking place. I guess it is indeed the variation in colour temperature of the floods because of flicker or similar effect. I don't know the exact type of floods but they seemed to me the same as used in some movie shoots I was at. Halogen I think they were not, they were too blue to be even gelled halogen floods, and halogen wouldn't exhibit any flicker at all. HMI? Sorry it ain't about Pentax cameras, but I think others shootin at similarly lit events might have exhibited the same problems. Cotty, you are the TV colour balance expert (setting Kelvins by eye with 100K precision, I rembemer!), but I think your cameras (TV) run at a whole lot slower shutter speed ;-) Still, whaddya think? somebody here is also shooting horses and similar with D2H, which has an ambient light WB sensor, which I heard is designed to detect flicker in fluorescents, do you exhibit same problem? Thanks Good light! fra
