H-a (hydrogen-alpha) at 656 nm (nanometers) is deep red in color and the most popular narrowband filter, and this 20nm H-a is the same formulation but in a wider bandpass. Hydrogen is ubiquitous in the cosmos and is present in emission nebula (North American, Pelican), planetary nebula (Dumbbell, Ring), Wolf-Rayet objects (Crescent, Thor’s Helmet) and supernova remnants (Veil). Many imagers like to present just a black-and-white H-a image of an object. It is has a beauty all by itself, like an Ansel Adams photo.
Astrodon 20 nm Filters – H-a 20nm
$350 – $875
Available on backorder
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Astrodon Hydrogen Alpha 20 nm filters are formulated just like our narrowband hydrogen alpha filters, but with a wider band pass.
Step up to the quality and performance of Astrodon filters.
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