Orion SkyGlow Broadband Light Pollution Reduction Filter 2"
Orion SkyGlow Broadband Light Pollution Reduction Filter 2"
The Orion SkyGlow broadband telescope eyepiece filter offers an advanced multi-layer "interference" filter that blocks the most common wavelengths of light pollution while allowing desirable wavelengths to pass through, yielding dramatically better deep-sky view! Orion SkyGlow telescope eyepiece filters feature improved blocking of mercury-vapor light (commonly used in streetlights) and higher transmission at critical hydrogen-alpha and hydrogen-beta lines compared to competing broadband filters. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly.
This contrast-enhancement effect is particularly apparent when observing nebulas with the help of a SkyGlow filter. Unlike stars, emission nebulae give off light in a narrow range of wavelengths. SkyGlow filters allow maximum transmission of the important wavelengths of hydrogen-alpha, hydrogen-beta, and doubly ionized oxygen - the ones most commonly emitted by nebulas. Views of galaxies and star clusters are also enhanced, although not as strongly!