BAADER H-ALPHA 20nm BANDPASS FILTER

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The Baader H-Alpha 20nm Bandpass filter is specifically designed for visual observation of faint emission nebulae under bright skies as well as imaging with colour CCD and CMOS cam eras. Much like the Super G O-III filter, the 20nm H-alpha filter acts as an exceptional high-contrast H-alpha/Red filter for RGB imaging with both mono and colour cameras. With highly efficient UV/IR blocking out to 1400nm, this filter helps reduce blurring caused by defocused light with refractor optics. The wide bandpass makes this filter suitable for use with fast optics, without the need to worry about pre-shifting as you do with typical narrowband filters. WARNING: This filter alone cannot be used for direct solar observation! Baader CMOS-Optimized filters - advantages Very high contrast due to steep edges of the coating Reflex-Blocker coatings to minimize reflections caused by correctors, reducers and other optical elements Standardized thickness for maximum possible parfocality - less need to refocus due to different filter thicknesses Blackened edges with front-side markings Each filter is individually fine-polished and coated with sealed coating edge, preventing moisture ingress Life-Coat for hardness and age-resistance, making the filters able to withstand tougher conditions for longer For more information on Baader's new generation of CMOS-optimized filters, check out this blog post! Specifications Transmission range H-Alpha Central wavelength 656.3 nm Half bandwidth 20 nm AR-coating Reflex-Blocker hard coated, planeoptically polished Filter thickness 1.25", 2" 2 mm (without cell), 6 mm with cell Filter size 1.25", 2" SKU 1.25" BA2961080 SKU 2" BA2961083 Show more