Celestron Oxygen III Narrowband Filter - 2" Round Mounted - 93624 GPS TeleVue 12mm Delos Eyepiece -

TeleVue 12mm Delos Eyepiece - 1

A complete system of adapter rings enables cameras to be directly (and rigidly) close-coupled for afocal projection

Substrates are free of striae and plane-parallel polished to within 30 seconds of arc

The SkyMaster Series binoculars are built to provide years of magnificent views of the world around you and the heavens above

If the filter is not adjusted precisely to the H-alpha wavelength

Celestron Oxygen III Narrowband Filter - 2" Round Mounted - 93624 GPS TeleVue 12mm Delos Eyepiece -About the Celestron Oxygen III Narrowband Filter 2" 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,