CELESTRON OIII 2'' FILTER

Reveal the faint detail of planetary and emission nebulae with the Celestron Oxygen III (OIII) narrowband filter. This 2" filter isolates the doubly-ionized oxygen emission lines at 496 and 501 nm while blocking the rest of the visual spectrum, producing extreme contrast between the dark sky background and nebula light. It is ideal for observing objects such as the Veil, Ring, Dumbbell, Crescent, and Orion nebulae, especially under light-polluted skies.

Features

• Narrowband OIII isolation: Targets the 496 and 501 nm oxygen lines for maximum nebula contrast.
• Full-spectrum blocking: Ultra-hard, vacuum-deposited coating blocks the visual spectrum from 400 to 700 nm.
• Dramatic contrast: Darkens the sky background to bring out faint nebula structure.
• Filter-threaded: Threads onto standard 2" eyepiece barrels.
• Durable coatings: Hard vacuum-deposited coatings for long-lasting performance.

Specifications

• Filter type: Oxygen III (OIII) narrowband nebula filter
• Transmission lines: 496 and 501 nm
• Blocking range: 400 to 700 nm
• Barrel size: 2"
• Purpose: Planetary and emission nebula observation