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Different color temps, for same exposure, with custom WB

Started Jul 22, 2016 | Discussions thread
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Mucles New Member • Posts: 8
Different color temps, for same exposure, with custom WB

Hello,

I'm trying to take photos of various small objects, outdoors, in an improvised photo box. No clouds in the sky.

Using a t4i, 100 macro, in manual mode, fixed ISO, and a custom white balance. Camera and object fixed for the experiment. I vary aperture and shutter speed to get constant exposure, about 10 combinations. Change exposure, and repeat experiment. The whole operation takes less than 5 minutes, so the position of the sun is more or less the same.

When viewing the photographs on a computer, the color temperature of the "white" background is not the same in all the photographs. In some photographs the the "white background" is browner, and in other the "white background" is bluer.

So the question is... should the color temperature change for the same exposure but different shutter speed and aperture combinations?

I see a similar thread here http://photo.stackexchange.com/questions/29830/how-does-aperture-size-or-shutter-speed-affect-color-temperature but from a physics perspective.

thanks

Canon EOS Rebel T4i (EOS 650D / EOS Kiss X6i)
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