1.25" UHC Filter for telescope eyepiece - Cuts light pollution deep sky astronomy imaging and also prevents chemical reactions

and also prevents chemical reactions with other elemental contaminants that may be introduced through a weakened seal

Additonal Specifications

which adds to cost and complexity

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

the flattener is a push fit 2" that is threaded to accept all standard 2" filters

1.25" UHC Filter for telescope eyepiece - Cuts light pollution deep sky astronomy imaging and also prevents chemical reactionsUHC Ultra High Contrast Filter 1. 25" Telescope Eyepiece Filter High Contrast Cuts Sky Light Pollution The UHC filter is the best all around dark sky nebula filter. It darkens the sky significantly with increased contrast between sky and nebula. The narrowband UHC 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