An Effective Weapon for Combatting Bright Skies, Bad Contrast
SkyGlow™ Broadband Light-Pollution Filters
Light pollution is waging war on amateur astronomy. But don’t surrender—fight back with an Orion SkyGlow broadband filter!
It’s an advanced multilayer “interference” filter that blocks the most common wavelengths of light pollution while passing desirable wavelengths with very little attenuation, yielding dramatically better deep-sky views.
SkyGlow filters feature improved blocking of mercury-vapor light and higher transmission at critical hydrogen-alpha and hydrogen-beta lines than competing filters. Bright, light-polluted skies appear much darker, and the contrast between object and sky is improved significantly.
Enhances All Objects
This contrast-enhancement effect is particularly apparent on nebulas. Unlike stars, emission nebulas give off light in a very 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 much.
Why suffer under light-polluted skies any longer? Order your SkyGlow light-pollution filter today. It really works!
The above is an ad by Orion and I would say that this filter lives up to it's claim. I've used this filter several times and it's in excellent condition. It comes with a filter case. There's no scratches or marks on the filter, it's been treated with "kid gloves". Orion sells their for 59.95 plus shipping. I'm selling my filter for $40.00 including shipping! I'll accept MO and PayPal. I how ever can not accept credit card payments, I'm not set up for that.