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The Calumet filter is a variable ND filter that reduces light by 1 to 9 stops, with a density range of ND2 to ND400. It is made from Japanese AGC glass, with no effect on color temperature and a hardness rating of 6H. The slim aircraft-grade aluminum frame reduces the risk of vignetting.
The 28 multilayer coatings include hydrophobic, oleophobic, scratch-resistant, and anti-reflective coatings. The double thread allows two filters or other accessories to be used, and a protective case is included.
Specifications are collected from official manufacturer websites. Please verify the specifications before proceeding with your final purchase. If you notice any problem you can report it here.