SVBONY Filter for Photography Broadband CLS Filter for Astronomical Observation Photography CCD Cameras and DSLR (1.25 inch

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 pollutants;specifically those produced by artificial lighting including mercury vapor lamps;both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere;such as sky glow Using: Together with the highly transparent in main nebula emission lines at OIII 496nm and 500nm;H beta 486nm;NII 654nm and 658nm;H alpha 656nm as well as SII 672nm;the filter is suitable for enhancing the contrast and getting more details for both visual and photographic purpose at sub rural areaOutstanding Features: Coating: Multi layers anti reflection coating. Non cementing optical substrate coatingFilter: Ultra thin filter cell minimize vignetting by maximize possibleExtinction 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 pass band than UHC and hence is more favored when observing under mild to moderate light pollutionLight pollution filter do not eliminate the effects of light pollution or increase the object’s brightness; in many cases;they increase the contrast between nebula and night sky;not brightening the nebulaWarning: the filters of SVBONY are not designed for sun observation;don not look directly into the sun with SVBONY filter;otherwise it will burn the eyesSpecifications: Type: city light suppression filter (CLS FilterMaterial: optical glass lens;aluminum frame Thread: Standard M28. 5x0. 6mmPackage includes: 1xSVBONY 1. 25 CLS filter 1xsturdy plastic case.