Thanks, yes, I understand Jupiter will still be bright, but I was thinking that the filter would make the background darker and for example there would be no unwanted beams anymore. It was the first time that I saw the beam though, so it doesn't happen so often. But yesterday the background was really bright and fuzzy and sort of pinkish/light violet! And it looked sort of "pixelated". I think it was more because of the moon than the street lamp because the street lamp is always there. From here the halo was at least twice the diameter of the moon...
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