Very nice. The Clip in issue won't affect me since Nikons don't have that facility, however getting a 2" threaded one would be the answer.
I was looking at the CLS one after I posted the question. The other one that comes recommended is an LPS-P2 filter which has a very similar spectral response as CLS with one additional peak passing.
Do you have any experience with shooting reflection nebula with the filter in place? Apparently these filters do have quite a bad effect on them, that said the blue part of the triffid is a reflection nebula and seems to have come out quite well in your picture...
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