The UHC (Ultra High Contrast) broadband filter is designed to improve the visibility of various deepsky objects. By selectively reducing the transmission of wavelengths of light pollutants, specifically those produced by artificial lightings 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. skyglow).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 details for both visual and photograghic purpose at sub-rural area with heavy light pollution.Main Use and Performance Suitable for color CCD cameras and unmodified DSLRs UHC with narrower passband provides higher contrast than CLS. Thus it is more suitable for urban environment where you suffer from severe light pollution. UHC has a substantial red passband and offer superb views for objects like the Orion Nebula (M42) Light 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 nebula. WARNING: The filters of Optolong are not designed for sun observation. DO NOT LOOK AT THE SUN WITH OPTOLONG FILTER. You would be BLIND if you fail to observe the warning. Spectral Curve The Major Emission Lines of Nebulae H-ß486.1nm OIII 495.9nm OIII 500.7nm H-a656.3nm The Major Emission Lines of Artificial Light Pollution Hg 435.8nm 546.1nm 577nm 578.1nm Na 598nm 589.6nm 615.4nm 616.1nm
