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For some reason I think the fsq series seems to be more reflection prone...
Don't know why? Rear element?
Although I have not used astronomic filters I would share my own data.
I have an fsq106 no reducer, and stl11k. Originally I had custom scientific filters, but I dropped the blue one and it smashed, I didnt have haloes with cs filters. I replaced them with a astrodon gen 1 filters, and I got haloes galore. Replaced them with astrodon gen2 filters, No haloes.
Brett
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