![]() Unlike other light pollution filters such as UHC and CLS, the L-Pro is multi-bandpass filter which offers better color balance by maximizing the transmission band. Being highly transparent to the main nebula emission lines at OIII (496nm and 500nm), H-beta (486nm), NII (654nm and 658nm), H-alpha(656nm) as well as SII (672nm).Selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lighting (including mercury vapor lamps, both high & low pressure sodium vapor lights, and the unwanted natural light caused by neutral oxygen emission in our atmosphere (i.e.All Optolong filters are made of high-quality anti-reflection coated Schott B260 glass that is fine optically polished to 1/4 wave. ![]() They have been designing and manufacturing filters since 1998 and supplying those filters to over 700 optical companies around the world. ![]() Greetings And thank you for visiting Agena AstroProducts. Optolong is not a newbie to the filter scene. The Optolong L-Pro (L-Professional) broadband filter is designed to improve the visibility of various deep sky objects. Affordable, Quality Telescopes, Binoculars and Accessories for the Astronomy Enthusiast. The filter is a powerful tool for isolating these two important nebula lines against the effect of light pollution and moonlight, and it saves time by allowing.
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