Celestron Oxygen III Narrowband Filters Product Info
Celestron Oxygen III Narrowband Filters 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 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 Celestron O III Narrowband Filters of less sophisticated coating technology.
Features of Celestron OIII Filters:
Narrowband filter for high transmission and high-contrast images
Blocks unwanted light-pollution
Ideal for viewing planetary nebulae and supernova remnants
Package Contents:
Clestron Oxygen III Narrowband Filter