Filter for astrophotography transmits 90% of light at 656.3nm wavelength (H-alpha)Full width half-maximum (FWHM) bandpass is 6.7nm or less for extra narrowband performanceAstrophotographgic H-alpha filter essentially blocks all other wavelengths of light, including light pollutionIdeal for Orion Parsec Astronomical Imaging CamerasThreaded to fit Orion 2" accessories, including nosepiece of Orion CCD cameras and inside Filter Wheels
Product DescriptionIf you are using a monochrome CCD camera
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