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SIRUI 18WA2NDX Neutral Density Filter for SIRUI VD-01 Anamorphic Lens for Smartphones Compatible with their 18mm Wide-Angle Lens (2nd Generation) and VD-01 Anamorphic Lens, the Adjustable Neutral Density Filter from Sirui helps reduce the amount of light entering the camera, which is useful for those who want to create motion blur effects that are associated with longer exposures. This filter uses German-manufactured Schott Plate Glass C270 and a ring on the front of the filter can be turned and allows for gradual adjustments from ND2 to ND400.