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Baader Planetarium Ultra Narrowband 4.5 nm SII CCD Filter - 50x50 mm Square - FSIINU-SQ50

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Baader 50x50 mm Square Ultra Narrowband 4.5 nm SII CCD Filter

Optimized for fast telescope optical systems with f/8 to f/3.5 focal ratios, this 50 mm square formatted Ultra Narrowband filter from Baader Planetarium provides users with a convenient entry point into the world of extremely narrow 4.5 nm SII CCD imaging. Enables increased contrast for the ionized sulfur (SII) range of the visible spectrum in order to highlight the most subtle detail while concealing stars even more. Features smooth internal surfaces and anti-reflective coatings.