Celestron OIII Narrowband Filter RASA 8

Enhance the imaging of nebulae with your RASA 8" astrograph by blocking light pollution, improving image contrast, and darkening the sky background. This filter allows only the key H-alpha and H-beta-OIII wavelengths of emission nebulae to pass through, providing high contrast. It selectively blocks the wavelengths of light from sources that pollute the sky and its natural glow. Unlike similar filters with narrower bandpasses, this filter is specially designed for use with fast F/2 optics. Fits into the integrated filter holder of the 8-inch RASA and ensures optimal optical performance.