NiSi Neutral density Filters create a darkening of the entire image, allowing you to photograph with a wider aperture or slower shutter speed than normally required. By slowing your exposure time or increasing your aperture, you are able to control the depth of field and convey movement in your images. NiSi Neutral density filters are made from high-quality optical glass with nano coating to prevent losing any single bit of detail. NiSi Neutral density filters offer a true to life color and do not affect the coloration of the image. Available in 3 Stop, 6 Stop with CPL, 10 Stop and 15 Stop.