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Glen. If I click where I live its says Bortle 5 SQM 19.72 (using ATLAS2015), or yellow 5.23 (using VIIRS2017). But the values change a lot if I go up or down my street - the park at the northern end is 20.10, the station at the other end is 19.65. I've got a 2" UHC filter that I haven't used for a while - might try it out again.
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