Sirui 18-WA-NDX-CN Variable ND Filter for Sirui 18mm Smartphone Lens

The Sirui Variable ND2-400 Filter for smartphone lenses is a Variable Neutral density filter designed to darken the entire image from 1 to 8 stops, allowing you to create images with wider apertures or slower shutter speeds by rotating the filter to the desired stop.  By slowing your exposure time or increasing your aperture, you’re able to control depth of field and convey movement in your image.  It’s made from German manufactured Schott Plate Glass B270 with exclusive lens coating process, allows many ultra-thin layers of coating to be placed on each glass surface to insure perfectly linear, uniform reduction of light from edge-to edge, maximum light transmission, reduced reflections and precise colour rendition.  The ND filter features a Protection Coating (waterproof, oil-resistant, scratch-resistant, anti-reflective, anti-static) for easy cleaning and superior lens protection.