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Ive just used the Lumicon Ha night sky filter to see how it records Ha and how it beats light pollution. Answer - exceptionally well. I live 4-5 km from CBD of BrisVegas and the full moon was up monday night and I was shooting almost directly into it. I attach a Combination of 15 min and 1 min shots with QHY8 camera binned 2x2 done in PS. This is going to be a luminance level for a LRBG of orion nebula when I get to finish processing it.
Comments more than welcome. As far as I can see from this first shot the ~30-40nm range of this filter does quite well.
Sorry about the jpeg compressions
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