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nice job Kon.
an UV/IR cut is required if you are using refractive elements (camera lens/coma corrector etc) otherwise you'll get some star bloat. I purchased a clip in L filter (wide uv/ir pass) which reduced star bloat especially on bright stars. it still comes out reddish in daytime shots but as Glen mentioned a simple white balance corrects this colour shift.
If you are considering a CLS v a CCD CLS (light pollution filters) you need the CCD CLS as it has the UV/IR cut the CLS doesn't.
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