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I've started using an astronomik CLS filter at my semi-dark sky out near York (70km from Perth CBD). It seems to work fairly well on the airglow as well as the light pollution. I've been playing with my new light box, it's interesting to compare the effect of the CLS on the led light, it certainly knocks the reds down, and appears to boost the blue- not sure how that works.
Cheers,
Andrew
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