Hi,
I also use the Astronomik CLS on my Nikon DSLR. Although I've only used it once, I found it introduced a very strange, non-linear background colour gradient. I'm expecting a light-box in a few days, so I'll be able to tell if this was the filter or the sky soon enough. It was relatively straightforward to deal with in Pixinsight, and the improvement in the image was noticeable.
cheers,
Andrew.
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