Celestron 93619 Black RASA Filter sku-728334050 050234936194

Celestron 93619 (sku-728334050; UPC 050234936194) is a Black H-Alpha/H-Beta/OIII narrowband imaging filter for the 8-inch RASA, listed under Solar Eclipse Glasses. It transmits selected light from emission nebulae while blocking much of the visible spectrum and light pollution; it is less suitable for broadband objects such as galaxies and star clusters.

Examples of imaging targets include the North America Nebula (NGC 7000), Lagoon Nebula (M8), Orion Nebula (M42) and Carina Nebula (NGC 3372). The filter has a black anodized machined-aluminum cell with a knurled rim and an anti-reflection coating.

It comes with a retaining ring, a foam-lined plastic storage case that can also hold the RASA's placeholder optical window glass, and a spectral transmission graph specific to the unit.