Optolong Ultra High Contrast (UHC) Filter 1.25" (32mm). UHC125
The UHC (Ultra High Contrast) 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 & 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 photographic purposes in a sub-rural area with heavy light pollution.. Main Use and Performance â¢ Suitable for color CCD cameras and unmodified DSLRs. â¢ UHC has a narrower band pass providing a higher contrast than CLS. It is more suitable for the urban environment where you suffer from severe light pollution. â¢ UHC has a substantial red band pass and offers superb views for objects like the Orion Nebula (M42). â¢ Narrow-band filters do not eliminate the effects of light pollution or increase the objectâs brightness. In many cases, they increase the contrast between nebula and the night sky, but do not brighten the nebula. â¢ WARNING: Optolong filters are not designed for sun observation. DO NOT LOOK AT THE SUN WITH AN OPTOLONG FILTER. BLINDNESS could occur if you fail to observe this warning.