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Lindecor » Telescope Filters » 1.25" Orion UltraBlock NarrowBand Filter

1.25" Orion UltraBlock NarrowBand Filter

Item Num: 5654
Regular: $79.99
On Sale: $71.99
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$8


The UltraBlock is a great 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.