OPTOLONG L-eXtreme FILTER Size:2" Due to its particular design

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OPTOLONG L-eXtreme FILTER Size:2" Due to its particular designThe Optolong L eXtreme filter is a light pollution dual band filter designed to drastically reduce the effect of light pollution. Its two passing bands isolate the nebulae emissions in H Alpha (red) and OIII (green blue). The advantage of the L eXtreme filter is that there is no transmission between the H Alpha and OIII lines as there are no nebula emission lines there. It blocks the light pollution, maximises nebulae signal and makes the sky

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