Code: 2458384 Baader 2 inch Narrowband H-alpha Filter 7nm passband
Ultra-narrow 7nm bandwidth with extremely high transmission for the shortest exposures possible. Completely rejects light pollution as well as blocking longer wavelengths in the far red regions. Plane-optically polished with an accurate 1-4th wavefront error over the entire surface. Includes anti-reflection coatings designed to prevent halos and image artifacts. The ultra-hard ion beam deposition ensures the coatings will never degrade from use or normal cleaning.
Used for high contrast deep sky images with a monochrome CCD cameras.