* Designed to be used with most smartphones with NiSi P1 Holder for Mobile * Phones Allows Reduced Shutter Speed * Allows Wider Aperture * Neutral Results, Visible, & IR Spectrums * NiSi Optical Nano Coating * Optical Glass Construction * Double-Sided And Multi-Layer Coating /Waterproof and Oil Resistant Nano Coating/ Ultra Low Reflection The NiSi P1 Prosories ND8 (3 Stop) for Mobile Phones is an ND filter that provides a 3-stop exposure reduction allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time you are able to control the depth of field and show movement in your images, for example, water flow. This filter is made from high-quality optical glass (not resin) with nano coating to prevent losing any single bit of detail. Neutral density filters do not affect the colouration of the image and the 0.9 density provides a 3 stop reduction in light from entering the lens. This filter is compatible with the NiSi P1 Prosories Mobile Phone Filter Kit.