1.25" Oxygen III Narrowband Filter (93623)

Available from Cloudbreak Optics when we last checked. Sold from the shop’s own store; the price there is the one that counts.

OVERVIEW The 1-1/4" OIII narrowband filter isolates just the two doubly-ionized oxygen lines (496 and 501nm lines) emitted by planet... DESCRIPTION The 1-1/4" OIII narrowband 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,