Orion 1.25" UltraBlock Narrowband Light-Pollution Filter

Orion 1.25" UltraBlock narrowband light-pollution filter.

Features:

• Rejects wavelenghts from incandescent and fluorescent lightning
• 99% Blocking of mercury and sodium emission bands
• Passing very high transmission of hydrogen-beta and ionized oxygen wavelengths
• The UltraBlock is the filter for deep-sky observers located at highly light-polluted sites
• Blocks all forms of light pollution
• Enhances the sky presence of a significant number of fainter deep-sky objects
• 1.25" filter

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 celestial objects over unfiltered and wideband-filtered views.

Please enquire when stock is indicated as zero.  Availability is typically within 2 months - please enquire.