for an architectural work, I would like to keep colors similar for a series of photos.
Now I started to use a white balance card (actually the white balance target of a XRite ColorChecker Passport).
I have taken a series of photos of an altar (built of red freestone/sandstone) in a church (using the same camera and the same lens) . During the shooting the natural light (sun through windows) changed a little bit (I guess 1 to 1.5 EV).
I took a first series of photos. During this time the sun did not change much. Then I took a shot of the white balance target. The white balance shot was about 0.3 to 0.5 EV different from the image series.
Then I shot a second series of images. The sun was now a bit darker but changed not much during this series. At the end I I took another shot of the white balance target. Again the second white balance shot was about 0.3 to 0.5 EV different from the second image series.
At home in Lightroom, I white balanced the first series of images using the first target shot and the Synchronize Settings dialog. And did the same for the second series and the second target shot.
My assumption was that at the end the colors of the altar should be more or less the same. But ... one serie of images is much warmer than the other and maybe a little bit more red.
Is there something I missed? Why are the colors of the image series not the same?
Thanks for your help.