Skywatcher Filter UHC Ultra High Contrast Size::2" get this one - http://www

get this one - http://www

with the aid of its fine-focusing facility

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

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" get this one - http://wwwThe 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.