AweSky is your free astrophotography gallery Miscellaneous > Misc > Optolong H-alpha
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Optolong H-alpha Astronomical filters, astrofilter. H-alpha (Hα) is a specific deep-red visible spectral line in the Balmer series created by hydrogen with a wavelength of 656.28 nm, which occurs when a hydrogen electron falls from its third to second lowest energy level.
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