Sorry for the delay in responding. I was asked to shoot candids at a wedding and have had to turn my attention to processing that rather large set of images.
George, the benefit I see in using a white balance card (as opposed to an Expodisk) is that you could have the option of using its values in post-production for selective adjustments, as I think are needed in this case (cooler sky; warmer tree and bird).
Ted, I am not afraid of technical. It pushes me to expand my knowledge and keeps me humble. (Very humble.
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Thanks for the contribution, Brian. Quite the variety of sky colour we have going here! The tree and the bird look pretty good, but I'm not loving the sky. I will get back to this when I finish processing the wedding pics. They are presenting their own white balance issues and so I am learning from doing them. I am curious though, about your technique. I also use C1, but don't understand how you use the B&W sliders on a colour image. Can you point me to a tutorial?