H-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter for the 8” RASA GoTo filter threads

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Description ED127mm Essential Series Aluminum Air-Spaced Triplet Refractor Item Number ES-ED127075-03 Focal Length 952mm Focal Ratio f/7

high precision 12mm thick mirror substrate flat for optimal image stability

high resolution and crisp definition

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H-alpha H-beta OIII (Hα-Hβ-OIII) Imaging Filter for the 8” RASA GoTo filter threadsEnhance imaging of nebulae with your 8 Rowe Ackermann Schmidt Astrograph (RASA) by blocking light pollution, improving image contrast, and darkening the sky background. This filter transmits only the key H H OIII wavelengths from emission nebulae, providing high contrast that makes them pop. This filter selectively blocks wavelengths of light from sources of light polluted skies and natural sky glow. Unlike similar filters with narrower bandpasses,