5D MkIII AWB

[apersson850]

They aren't related. But if you expose brighter, then areas that are supposed to be white will look brighter, which to us is "whiter", so one can get the impression that there's a relation to exposure.
After all, from a white balance point of view, black, grey and white are all the same color, just with different luminosity.

[photojohn]

You can use the Kelvin scale in the 5DIII - the image above may need a 3000 - 3200K and you would be really close in camera. Auto WB on my 5DIII is okay, but far from perfect.