On Nov 29, 2010, at 1:57 PM, Igor Roshchin wrote: > > Mon Nov 29 09:52:30 CST 2010 > P N Stenquist wrote: > >> On Nov 29, 2010, at 10:39 AM, Igor Roshchin wrote: >> >>> >>> Hi All, >>> >>> While shooting an argentine tango performance over the weekend >>> I set the WB of my K-7 to "Tungsten light". >>> I was surprised to see that while ~80% of shots were with about the >>> right >>> color, some considerable number of shots had a distinctive. >>> It was not as red as it would have been if I left the WB to be on >>> Auto, >>> but still yellow. >>> >>> All the shots were taken under the same condition: in the same room, >>> from the same point, with no light changing, just the couple moving. >>> More over,- some series of shots were made with the the couple in >>> place ,- >>> and some have the WB alright, and some - are yellow. >>> >>> Has anybody experienced anything of this sort? >>> What could be the reason (besides some malfunction of the camera)? >> >> What fills the frame affects white balance. If the dancers were blocking >> some of the light on some shots and more fully lit on others, you'll get >> some variation of color temp. Easy enough to correct during conversion. >> Paul >> > > Paul, > > Yes, that could do it in principle, but it doesn't make sense in the > current situation. Since I _fixed_ the WB to a particular setting, > very slight changes shouldn't affect the WB. > > To better illustrate what I observe, - let me show you this image: > http://komkon.org/~igor/PHOTOS/Mixed-2010/WB-problem-2010-11-27.jpg > > No WB or exposure settings were changed in this sequence. > These photos were not modified. > > Yes, one can correct the WB, but it is not how it should work, isn't it? > > Igor > You're right. Something is out of whack here. I never shoot anything expect AWB and RAW, so I can't tell you if my camera shares this problem. When I have time, I'll give it a try under some tungsten lighting. Paul
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