LP-3 Oxygen III Line Band Filter 2"

The Thousand Oaks LP-3 O-III filter in 2" format is your go-to tool for visually enhancing planetary and emission nebulae that radiate strongly in the doubly ionized oxygen (O-III) line at 500.7Å. Designed for visual observers working under light-polluted or naturally hazy skies, this narrowband filter dramatically increases contrast by isolating the O-III line while sharply cutting off surrounding wavelengths, including light pollution, moonlight, and atmospheric airglow. Nebulae like the Veil, Helix, Dumbbell, and Lagoon appear more defined and stand out against a much darker background sky. With its standard 2" threaded format, the filter is ideal for pairing with long focal length eyepieces for wide-field views of large nebulae—especially in medium to large aperture telescopes.