Optolong 2" L-Pro Light Pollution Filter

Optolong LPro LProfessional is a multibandpass filter which selectively suppresses the transmission of light pollution lines For example mercury vapor lamps high and low pressure sodium vapor lights and skyglow caused by emission from neutral oxygen in our atmosphere LPro enhances the transmission of major emissions from nebula while offering great color balance with its wide yet effective light pollution cutting transmission band The balanced transmission allows objects with wide emission spectrum such as galaxies to be imaged with minimal color cast easier to correct in postprocessing Among the emission lines enhanced are OIII 496 500nm Hbeta 486nm NII 654 658nm Halpha 656nm and SII 672nm Available in 2 125 and selected DSLR camera sizes Features 90 transmission at major nebula emission lines Multilayers antireflection coating Precise and sharp rolloff at light pollutant lines 2 mm filter thickness 125 2 and 77mm 1mm clip series Made on Schott substrate Finely polished to 14 wave accuracy Surface quality 6040 MILO13830 standard Best Uses Monochrome oneshotcolor CCDCMOS camera Deep sky color imaging particularly reflective nebula and galaxies