Ultra High Contrast Telescope Filter - 1.25"

The Optolong Ultra High Contrast (UHC) Filter is a broadband light pollution reduction filter designed to enhance deep-sky observations and astrophotography in urban and suburban skies. By selectively suppressing light pollution wavelengths while maintaining transparency at key nebula emission lines (OIII, H-beta, H-alpha, NII, and SII), it increases contrast between faint nebulae and the background sky. This 1.25-inch filter features an ultra-thin cell design with a 26mm clear optical aperture and is compatible with visual observing and color CCD/DSLR imaging, offering superior contrast compared to broader light pollution filters.