SVBONY Telescope Filter 1.25 inches CLS Filter City Light Pollution Reduction Filter Broadband Filter Suitable for Deep Sky Visual Astronomical Photography

SVBONY city light suppression broadband filter is designed to improve the visibility of various deep sky objects By selectively reducing the transmission of wavelengths of light pollutantsspecifically those produced by artificial lighting including mercury vapor lampsboth high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmospheresuch as sky glow Using Together with the highly transparent in main nebula emission lines at OIII 496nm and 500nmHbeta 486nmNII 654nm and 658nmHalpha 656nm as well as SII 672nmthe filter is suitable for enhancing the contrast and getting more details for both visual and photographic purpose at subrural area Outstanding Features Coating Multi layers antireflection coatingNon cementing optical substrate coating Filter Ultrathin filter cell minimize vignetting by maximize possible Extinction Treatment Aerometal material precise CNC machining sand blasting Process black anodized finish extinction treatment to prevent reflection laser CLS engraving no fading CLS with wider passband than UHC and hence is more favored when observing under mild to moderate light pollution Light pollution filter do not eliminate the effects of light pollution or increase the objects brightness in many casesthey increase the contrast between nebula and night skynot brightening the nebula Warning the filters of SVBONY are not designed for sun observationdon not look directly into the sun with SVBONY filterotherwise it will burn the eyes Specifications Type city light suppression filter CLS Filter Material optical glass lensaluminum frame Thread Standard M285x06mm Package includes 1xSVBONY 125 CLS filter 1xsturdy plastic case