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and only the emission line of hydrogen beta will pass
the 127mm is also compact enough to mount on a giant telescope
These ultra-wide angle eyepieces played a critical role in the military for aiming at targets
Clarity and Precision for Outdoor Adventures
Just plug it in and a green light indicates when the filter is onband and ready to go
Astrozap Dust Cover For 12" Dobsonians Light Shroud_For 14" Dobs and only the emission lineAstrozap Dust Cover ForMeade & Skywatcher Dobsonians Made from lightweight breathable black fabric. Elastic bands ensure a good fit. Keeps dust off secondary and primary mirrors. Dust covers will fit on both the upper and lower tube assemblies. Made in the USA! Astrozap Dust Cover Sizes: 6 fits 8" diameter tubes 8 fits 10" diameter tubes 10 fits 12" diameter tubes 12 fits 14" diameter tubes 14 fits 16" diameter tubes 16 fits 18" diameter tubes