The NiSi 49mm HUC PRO Nano-IR Neutral Density Filter ND8 (0.9) 3 Stop has been specifically designed to reduce the light entering the camera by 3 stops. This filter is made from high-quality optical glass with a nano-coating to avoid loss of detail. Neutral density filters do not affect the color rendition of the image, and the 0.9 density provides a 3-stop reduction of light entering the lens. With the ND filter, the entire image is darkened, allowing you to shoot with a wider aperture or a longer shutter speed than normally required. By slowing down the exposure time or widening the aperture, you can control the depth of field and convey motion in your images. The ND8 is commonly used to capture the flow of water in seascapes and to create larger openings when using flash outdoors.