Thanks for your advices.

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You have no reason to correct for light pollution with a filter such as the L-Ultimate, so just don't.
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andrea tasselli: That is a valid point. I normally don't. But I thought that some artificial light might not be fully removed by the filter. |
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Unless you shine a light directly into the 'scope, no, there is nearly nothing there other than signal. Assuming good flat fielding technique, that is.
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