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Baader Planetarium Narrowband H-Alpha Filter 3.5nm, 50.4mm Round Filter

The three sizes of 3.5nm Enforced-Narrowband filters open up the extremely narrow 3.5nm H-alpha world.  This enforced contrast provides more signal of the faintest nebula detail.  Manufacturing such ultra-narrow filters requires extreme coating homogeneity and very high Center Wavelenth Precision, which these filters have been designed for. 

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