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Baader Planetarium Ultra Narrowband 4.5 nm SII CCD Filter - 2" - FSIINU-2

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Baader 2" Round Ultra Narrowband 4.5 nm SII CCD Filter

This Baader Planetarium Ultra Narrowband SII CCD Filter is presented in a 2" round format and is best suited for fast f/8 to f/3.5 telescope optical systems. With this filter, users are given an introduction to the field of exceptionally narrow 4.5 nm SII CCD imaging. Enhanced ionized sulfur (SII) contrast emphasizes faint details in nebula while simultaneously suppressing more stars. Contains smooth interior surfaces with anti-reflective coatings.