K&F CONCEPT 67mm Variable ND Filter ND2-400 1-9 Stops with Silicone Cap Slim Adjustable Fader ND2 ND4 ND8 ND16 to ND400 Neutral Density Filter, for Beach Rivers Outdoor Nano-K Series FN303

1-8.6 Stop : ND2-400 Filter Reduces light intake from 1 to 8.66 f-stops, intended for long exposure and motion blur, Suitable for rivers, waterfalls and other waters, especially under strong light. High-end Japanese optical glass: Variable neutral density filter made of high-end Japanese optical glass, double-sided multilayer blue coating is conducive to waterproof and dustproof. Filter Cap: Silicone material, soft and smooth, skin-friendly, not easy to stain, dirt-resistant, and easy to clean. Protects the variable ND filter. Suitable for K&F, KENKO, HAYA, GOBE and others(But not for Tiffen). Double anti-reflective coating: VND allows the use of slow shutter speeds on high speed films or digital cameras to record movement/image blur in waterfalls, clouds or any fast moving subject. Ultra-Slim filter frame: Adopt aviation aluminum alloy frame, only 7.3mm, ultra slim rim design preventing wide angle vignetting. Not recommended for use with wide angle lenses with focal lengths