"The Kelvin scale in color theory is based on the blackbody curve locus, which indicates what color a perfect blackbody radiator would reflect, if heated up at different temperatures measured in Kelvin. As a single parameter this is too limiting, or even outright misleading for all possible light situations, so the actual color temperature should also be annotated with a second parameter indicating how far away. and in which direction from the blackbody locus the actual value is."
This simply means that color temperature in Kelvins is not sufficient to set WB - it can be set only for very simple lighting situations.
My older daughter, 23, big pain And I'm her father.
Man-Fai Wong said:
preference for using Nikon's built-in WB presets instead of in-camera custom WB. That post combined w/ the above article would suggest to me that Nikon's in-camera WB presets probably attempt to provide some reasonable offsets to correct for variance from the black body Kelvin temperature (or maybe use the help of preset setting as a starting point for figuring out what the variance is). IOW, Nikon might be more capable to account for variances if you tell it what the primary light source is.
Little bit more complicated, especially in case of light sources with line spectrum. Nikon is using simplified spectral correction, and you can not imitate that even with click on gray. First you need to choose correct light source at least to allow algorithm to work.
That is why I think WB coefficients are rather misleading, and compromizing camera capabilities if everything is based on those 2 numbers.
It really depends on the converter used. For NC and RML it is choosing the type of light and compenstion; then setting WB from neutral subject. We will add some options for white balance to support independent setting of white balance sliders and type of light. We are also working on support of light spectrum readings EyeOne Photo provides.
Although I would agree that the Expodisk is absurdly expensive (at about $100 USD) it does make setting white balance very easy and accurate.
There are lot's of ways to set white balance. I've tried many. Finally, I bought the Expodisk because it's accurate, small, sturdy, handy (it hangs from my neck on it's included strap - see my Avatar) and convenient.