Narrow band sulfur filter (S-II) with a half width of 8 nm for astrophotography.
• type: narrow-band nebula filter • Transmission band: S-II around 673 nm • FWHM (half width): 8 nm • thickness: 2 mm • size: 36 mm without frame • covers: dielectric, optically flat, polished • maximum light output: up to f / 2.8
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