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Condition: This is a used 1.25" Orion SkyGlow UltraBlock filter made in Japan. It is in a jewel case, but with no box. It is in excellent condition, with clean optics and an unmarked body.
Due to its age, and the lack of listings for this exact item (it says both SkyGlow and UltraBlock on it), we cannot determine if this is a broadband or narrowband filter. We're inclined to think it's the latter, but you'll have to do your own research. Either way, at just $50 for a Japanese-made filter, it's a bargain.
The information below is the copy from Orion on the narrowband UltraBlock filter:
- In areas plagued with significant light pollution, our UltraBlock eyepiece filter greatly increases contrast of emission and planetary nebulas
- Allows you to see features and details through a telescope that would normally be lost due to light pollution
- Blocks all forms of light pollution while passing critical hydrogen-beta and ionized oxygen wavelengths of light
- Enhances the sky presence of a significant number of fainter deep-sky objects
- Use with any filter-thread equipped 1.25" Orion eyepiece. Metal filter cell construction.
The 1.25" Orion UltraBlock Narrowband telescope eyepiece filter is the filter of choice for deep-sky observers viewing from highly light-polluted sites.
Light pollution can significantly decrease the quality of telescopic views of deep-sky objects. The UltraBlock filter blocks all forms of light pollution from incandescent and fluorescent lighting, including mercury vapor and sodium emission bands, while passing critical hydrogen-beta and ionized oxygen wavelengths. With an UltraBlock telescope eyepiece filter, emission and planetary nebulas "surface" from the washed-out background sky seen from light-polluted areas. With contrast increased, you'll be able to discern more detail in deep-sky observations.
In dark skies, the UltraBlock also enhances the sky presence of a significant number of fainter deep-sky celestial objects. You'll see more of these faint nebulas, galaxies, and clusters with an UltraBlock compared to unfiltered and wideband-filtered views. You'll simply see more with an Orion UltraBlock filter!
The handy 1.25" UltraBlock filter can be installed on any 1.25" filter-threaded telescope eyepiece.