Celestron Oxygen III Narrowband Filter - 1.25" Round Mounted - 93623 Tele Vue Plossl Eyepieces Highest Useful Magnification: 213 x

Celestron Oxygen III Narrowband Filter - 1.25" Round Mounted - 93623 Tele Vue Plossl Eyepieces Highest Useful Magnification: 213 xAbout the Celestron Oxygen III Narrowband Filter 1. 25" 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

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