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Baader Planetarium Ultra Narrowband 4.5 nm SII CCD Filter - 65x65 mm Square - FSIINU-SQ65

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Baader 65x65 mm Square Ultra Narrowband 4.5 nm SII CCD Filter

Boasting a square 65 mm design, smooth internal surfaces, and anti-reflective coatings, this Baader Planetarium Ultra Narrowband Filter presents the user with the opportunity to experience uniquely narrow SII CCD imaging at 4.5 nm. Improves contrast for the ionized sulfur (SII) spectral range, thereby better emphasizing the most subtle of nebula detail while blocking out a greater number of stars.