Optolong L-Ultimate Dual Band 3nm 2 Inch Filter 93323 that is the heart of

Optolong L-Ultimate Dual Band 3nm 2 Inch Filter 93323 that is the heart ofOptolong L Ultimate Dual Band 3nm 2 Inch Filter Optolong L Ultimate Dual Band 3nm 2 Inch Filter 3nm is designed to drastically reduce the effect of light pollution. The 3nm bandwidth means it strongly isolates the nebulae's emissions into H Alpha (red) and OIII (green blue) from anything else. It blocks light pollution, maximizes the signal from nebulae, and darkens the sky background. It also blocks artificial light from mercury vapor lamps, high and

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