Astromania 1.25" O-III Filter for Nebulae Observation - Enhances Contrast

The Astromania 1.25" O-III Filter is a specialized narrowband filter designed to significantly enhance the contrast of diffuse, planetary, and extremely dim nebulae during visual observation and astrophotography. It isolates the light of doubly ionized oxygen (O-III) lines (496-501 nm), effectively suppressing all other visible wavelengths. This makes faint objects like the Veil, Ring, Dumbbell, and Orion nebulae much more visible against a blackened background, even under light-polluted skies. It outperforms UHC filters for most planetary nebulae and all types of nebulae with apertures of 10" or more.

Features:
* 1.25 inch O-III Filter greatly enhances contrast during visual observation of gaseous and planetary nebulae in all sky conditions.
* Allows high-contrast imaging even in areas with strong light pollution.
* Especially useful for large aperture telescopes; allows only Double Ionized Oxygen lines (496nm to 501nm) to pass through at 95 percent.
* Completely blocks virtually all other visible wavelengths of light, optimizing views of nebulas.
* Increases contrast through selective filtration.
* Anti-reflection coated to prevent glaring and ghosting.
* Useful at both light-polluted and dark sky sites.
* Compatible with all 1.25 inch eyepieces.
* Filter made from high-grade glass with dichroic interference and antireflection coatings.
* Each Astromania 1.25inch O-III Filter is individually inspected and proudly inscribed with the percentage of light transmittance of the two O-III emission lines.

Material: High-grade glass with dichroic interference and antireflection coatings.
Dimensions: Standard 1.25 inch barrel diameter.
Use cases: Visual observation and astrophotography of gaseous and planetary nebulae, particularly beneficial for objects like the Veil, Ring, Dumbbell, and Orion nebulae. Performs well under both light-polluted and dark skies.