OPTOLONG L-PRO 1.25'' Anti-Pollution Filter for CCD & DSLR Cameras, 90% Transmission of Main Nebulous Emission Lines, Optical Glass, 77.0mm Lattitude $columns = $('

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OPTOLONG L-PRO 1.25'' Anti-Pollution Filter for CCD & DSLR Cameras, 90% Transmission of Main Nebulous Emission Lines, Optical Glass, 77.0mm Lattitude $columns = $('The Optolong L Pro (L Professional) 1. 25" filter is designed to provide maximum spectrum brightness and improve the visibility of various deepsky objects, particularly nebulose objects, by selectively reducing the transmission of wavelengths of light pollutants, especially those produced from artificial lighting including mercury vapour lamps, high and low pressure sodium vapour lamps and unwanted natural light caused by the Neutral oxygen emission