Orion 5657 2-Inch UltraBlock Narrowband Eyepiece Filter

Orion 5657 2-Inch UltraBlock Narrowband Eyepiece Filter

• The Orion UltraBlock is the ideal eyepiece filter for deep-sky observers located at highly light-polluted sites
• Narrowband filter blocks all forms of light pollution
• Enhances the presence of a significant number of fainter deep-sky objects
• Compatible with threaded Orion 2" eyepieces. Metal filter cell construction.
• Save yourself a trip to dark skies - with the UltraBlock filter you can enjoy the stars from the suburbs!

The UltraBlock is the filter for deep-sky observers located at highly light-polluted sites. Blocks all forms of light pollution - mercury vapor and sodium emission bands - while passing the critical hydrogen-beta and ionized oxygen wavelengths. With an UltraBlock, emission and planetary nebulas surface from the washed out background sky. In dark skies, the UltraBlock also enhances the sky presence of a significant number of fainter deep-sky objects over unfiltered and wideband-filtered views.