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Our Oxygen-III Nebula filter provides extremely selective filtration to bring out elusive detail in diffuse and planetary nebulas
Orion's O-III eyepiece filter transmits close to 90% of the light corresponding to the two oxygen-III spectral lines at 496nm and 501nm while completely blocking virtually all other wavelengths
The O-III Nebula filter provides enhanced views of diffuse and planetary nebulas such as the Veil, Swan, Ring, Dumbbell, Helix, and Eagle nebulas, to name a few
Recommended for visual use, not intended for astrophotography
Available in two sizes, 2" and 1.25" for use with either 2" or 1.25" telescope eyepieces and accessories
http://www.telescope.com/Accessories/Telescope-Eyepiece-Filters/Orion-Oxygen-III-Nebula-Filters-for-Eyepieces/pc/-1/c/3/sc/48/e/27.uts
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