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Short description of Celestron Oxygen III Narrowband Filters by Celestron before your review - 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
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