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Celestron Oxygen III (OIII) Narrowband 1.25" Filter - 93623

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SKU: CEL-93623

Celestron 1.25" O III Narrowband Filter

The Celestron 1.25" O III narrowband filter isolates just the two doubly-ionized oxygen lines (496 nm blue and 501 nm green 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 O III light needed for detailed views of the Veil, Ring, Dumbbell, Crescent, and Orion nebulae, among other objects. Each filter has an ultra hard, vacuum-deposited coating carefully designed to block all of the visual spectrum ranging from 400 nm to 700 nm This eliminates the un-natural colored halos surrounding bright stars common with O III filters using less sophisticated coating technology.