The Celestron OIII Narrowband Telescope Filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae, while blocking the rest of the overall spectrum of light. The result is extreme contrast between the black sky background and the faint photons of OIII light needed for detailed views of the Veil, Ring, Dumbbell, Crescent and Orion nebulae, among other objects.

Each Celestron OIII Narrowband Telescope Filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology.

(Psssst! If you have ever wondered how to see the Helix Nebula with your telescope, this is the way! ;)

• Isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planetary and emission nebulae

   

   

• Blocks the rest of the overall spectrum of light

   

   

• Eliminates the un-natural colored halos surrounding bright stars common with O III filters of less sophisticated coating technology

   

   

• Ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 to 700 nm

   

   

• 2" round threaded cell design fits almost all standard 2" telescope eyepieces

Filter Type: OIII Narrowband

Format: Round Mounted

Size: 2"

Construction: Threaded Aluminum Cell