Used Orion 1.25" UltraBlock NarrowBand Filter

This is a used Orion Ultrablock filter made in Korea. It is in excellent condition, with clean glass and body. It includes a filter case. Any dust you may see in the photos is removable - it seems that these filters develop an electrostatic charge such that the dust in the air is just attracted to the 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.