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Baader Planetarium Ultra Narrowband 4.5 nm OIII CCD Filter - 50x50 mm Square - FOIIINU-SQ50

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

This premium grade Baader Planetarium filter allows users to become familiar with the world of ultra narrowband 4.5 nm O-III CCD imaging. Telescopes with fast optical systems in the f/8 to f/3 focal ratio range are ideal for this 50x50 mm square IR blocking filter to be used with. With this 31 mm Ultra Narrowband filter, imaging results are halo, reflection, and ghosting free. Features non-ageing sealed edge coatings.