Orion 5657 2-Inch UltraBlock Narrowband Eyepiece Filter
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Orion 5657 2-Inch UltraBlock Narrowband Eyepiece Filter Description
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 v…