Specifications
This narrowband filter has a 7nm bandwidth of light centered on a wavelength of 656nm 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 (i.e. skyglow). Better choice of narrowband H-alpha astrophotography filter for highest contrast and revealing subtle nebula details.
Filter Size 2 inch Polish 1/4 wavefront, Parfocal Transmission Range Tave>80% 656 nm, 7nm FWHM Coatings Multilayer Anti-reflection Type Narrowband (7nm) Shape Round Thickness 5mm (filter) + 2.5mm (thread) Thread M48, 0.75 pitch
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