![]() ![]() Optolong H-Alpha Filter 7 nm, 1.25"H-Alpha 7 nm filter is the most popular narrowband filter allowing 7 nm bandwidth of light centered on a wavelength of 656 nm through, and reducing the transmission of certain wavelengths of light, specifically those produced by artificial light including mercury vapor, and both high and low pressure sodium vapor lights and the unwanted natural light caused by neutral oxygen emission in our atmosphere (skyglow).īest choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details. Optolong L-Ultimate Review Agena Astro affiliate Galactic Hunter created this detailed written review of the Optolong L-Ultimate, plus a video version. The filter is a powerful tool for isolating these two important nebula lines against the effect of light pollution and moonlight, and it saves time by allowing.
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