Hmmm, interesting question. I've just started playing around with WB settings in my DSLR to combat excessive LP causing red sky tones overall. But in RAW mode I suspect WB has no effect as it can be all managed through RGB levels during processing.
Haven't had a chance to experiment yet other than inside the camera controls but I'll be interested to see what the experts have to say on this.
An Astronomik CLS filter so far has proved the best solution to LP and good DSO colours as it also has some minor Ha response improvement apparently.
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