The Astrodon filters are USA made.
Conservative. Idaho. Software engineer. Historian. Trying to prevent Idiocracy from becoming a documentary.
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Saturday, March 5, 2022
Made in USA
I have been looking for some H-alpha filters not made in China. What is an H-alpha filter? It is a narrow band (typically 3 to 5 nm wide) filter used to catch only the brightest parts of nebulae on astrophotographs. It is the light emitted when a hydrogen electron drops from shell level 3 to level 1 (or more precisely from energy level 3 to level 1). This makes nebulae such as M42 stand out brighter than they otherwise would.
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