CEHHOIIIR8

93619

Celestron

Designed specifically for their 8" Rowe-Ackerman Schmidt Astrograph (RASA) telescope, Celestron's Narrowband H-alpha / H-beta / O III Imaging Filter blocks all but three wavelengths of light to improve your shots of wispy nebulae like the NGC 7000 North America, M8 Lagoon, M42 Orion, and the NGC 3372 Carina.Purpose Built Engineered specifically to work with RASA's fast f/2 opticsFits into the 8" RASA's integrated filter mountTo install, remove the OTA's clear window and replace it with the filter optical performance for the entire system is maintainedNo adapter is needed for installationSelective Filtration 85% or higher transmission at 486nm, 496nm/501nm, and 656nm wavelengths, less than 0.5% of all other wavelengthsTransmits only the Hydrogen-alpha, Hydrogen-beta, and Oxygen-III wavelengths from emission nebulae to enhance contrastWill not dim the nebulae, it only makes the background blackerSelectively blocks wavelengths of light-polluted skies and natural sky glowEliminates the effect of light pollution while letting the "good" wavelengths of light associated with emission nebulae pass through to the cameraEach filter comes with its own spectral transmission graph that verifies its performanceNot recommended for use on broadband emission objects such as galaxies and star clusters.Design and Construction Details Made of 2mm thick Schott B270 glass with optically flat surfaces free of defectsDichroic multi-bandpass and multilayer anti-reflection coatings46mm (1.81") filter diameter with 43mm (1.69") clear apertureBlack anodized aluminum cell with knurled rim for easy grip during installation