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Explore Scientific Nebula Filter 2" UHC. Condition is used but in flawless condition.   Shipped with USPS Priority Mail. 
Explore Scientific Nebula Filter 2" UHC Range from 458nm to 508nm with peak at 488nm. Transmission 96.7%UHC - This is an ultra-high contrast narrow-band filter, designed for observing the broad range of nebulae with 2.0-inch standard eyepieces or filter wheels. The bandpass is tighter than the CLS Nebula Filter, thereby blocking even more light from artificial lights and airglow.Designed to better enable nighttime viewing of nebulae through telescopes featuring a 2"-diameter eyepiece, the UHC Nebula Filter from Explore Scientific increases viewing contrast by blocking a majority of the wavelengths of light pollution in order to gain increased detail. This filter passes the H-Alpha and H-Beta emission lines at 486nm and 656nm, as well as oxygen emission lines at 496nm and 501nm, in order to brighten nebulae while darkening the sky background for increased contrast and subject definition. Compared to unfiltered observation, this UHC filter offers clear visibility of the Owl Nebula M97, Veil Nebula NGC6992, and even the Dumbbell Nebula M27 when observing under typical terrestrial lighting.

Filed under: Eyepieces & Accessories