Skywatcher Filter UHC Ultra High Contrast Size::2" The RGB enhancement of the

The RGB enhancement of the Neodymium substrate actually boosts color contrasts

Features a 4 x element design with one element made from FPL51 ED glass

A brass compression ring holds eyepieces firmly in place

the CPC 925 GPS optics are individually matched and hand figured to ensure the highest optical quality in every telescope

Skywatcher Filter UHC Ultra High Contrast Size::2" The RGB enhancement of theThe narrowband UHC filter, like the O III filter, isolates the two doubly ionized oxygen lines (496 and 501nm) in addition to the hydrogen beta line (486nm) emitted by planetary and most emission nebulae. This filter permits superb views of objects like the Orion, Lagoon, Swan and other extended nebulae. It performs well in smaller aperture instruments owing to its greater light transmission than the O III, yet still suppresses light pollution well.