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H-alpha filter passes light at 656nm wavelength. Best choice of narrowband H-alpha astrophotography filter for high-contrast imaging and revealing rich details of the nebula even in areas with strong light pollution,
H-alpha 1.25" narrowband filter (wavelength 656nm)
Incredible contrast for all emission nebulae when using CCD or webcams. Take superb deep sky images directly from the middle of town.
Naturally also perfectly anti-reflection coated and plane-optical polished!
