Specifications
Extra narrowband SIICCD 7nm filter (Sulful II for CCD) is designed for nebula observation allowing 7nm bandwidth of light centered on a wavelength of 672nm 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)
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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