Skywatcher Filter UHC Ultra High Contrast Size::2" A brass compression ring holds

A brass compression ring holds eyepieces firmly in place

Bahtinov masks grip the telescope tube gently but firmly with three metal posts covered in non-scratching silicon sleeves

Threaded for 1

yet significantly boosts overall contrast

The RGB enhancement of the Neodymium substrate actually boosts color contrasts

Skywatcher Filter UHC Ultra High Contrast Size::2" A brass compression ring holdsThe 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.