Classic Lumicon 1.25 Inch Oxygen III Filter, 2nd Quality
Discount: 2nd Quality with small imperfections that shouldn't matter in visual use.
Classic Lumicon 1.25 Inch Oxygen III Filter
Lumicon 1.25 Inch Oxygen III Filter visually isolates the two doubly ionized oxygen lines (496 and 501nm lines) emitted by diffuse, planetary and extremely faint nebulae.
Oxygen III Filter helps faint objects become much more visible against the blackened background of space and produces near-photographic views of the Veil, Ring, Dumbbell and Orion nebula, among many other objects. This filter performs well under both light-polluted and dark skies.