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I use the Astronomik UHC filter with my Televue Ethos and Delos eye pieces when observing nebulae under Bortle 3 skies with my 12” Goto dob. The UHC filter definitely exposes the nebulosity with more contrast and colour
I don’t know whether you would have the same performance under Bortle 6/7 but I’m sure it would make a significant difference
Cheers
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