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The ZWO H-Alpha filter has a bandpass of 7nm centred at the 656nm wavelength, with light transmission close to 90%. This filter is a great choice for narrowband H-alpha astrophotography, delivering high-contrast imaging and revealing rich details of the nebulae even in areas with strong light pollution.
This filter can reduce 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 (i.e. skyglow).
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Name: ZWO New H-Alpha Narrowband 2″ Filter
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