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Charles, did you need to use any LP filter or sky glow filter with the Helix shot? I know I can get away with 3 and 4 minute subs before the sky glow becomes an issue but I guess I am a lot closer to the highway lights than the observatory site at Linden. I'm about 1o minutes drive west of there, but only around 400 metres from the highway and it's dreaded mercury vapour lights
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