Lumicon 2x22 UHC Ultra High Contrast Telescope Filter LF3030

The ULTIMATE nebula filter. The original Lumicon 1.25", 2", and 2" Cassegrain, Ultra High Contrast Filters are unbeatable for revealing nebulosity. This is achieved by passing three nebula emission lines-the two doubly ionized oxygen lines (496 and 501nm) and the H-beta line (486nm)-while blocking light-pollution and Sky Glow.