These 3.5 and 4.5nm H-alpha and SII Ultra Narrow Band Filters open up the extremely narrow 3,5nm H-alpha and 4.5nm SII world. This enforced contrast results in even fainter stars, providing more signal of faintest nebulae detail. Manufacturing such ultra-narrow filter does require extreme coating homogeneity and very high Center-wavelength precision, which these filters are designed for.
Now also available in 2", 50mm, 65mm and 1.25" sizes
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