Light Pollution filter comparison. Orion SkyGlow LP filter and the IDAS LPS- D3 filter. - YouTube
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M45 - The Pleiades ( Emil Andronic ) - AstroBin
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IDAS filtro nebulare LPS-D2 2"
M31 - IDAS LPS D1 vs D2 in Bortle 8 skies - DSLR, Mirrorless & General-Purpose Digital Camera DSO Imaging - Cloudy Nights