The 100x150mm Smooth Nano IR Graduated Neutral Density Filter? ND8 (0.9) ? 3 Stop is a rectangular filter that helps darken specific areas of an image, such as bright skies, while allowing normal, unaffected exposure in other image regions. The filter is densest at the edge and tapers to clean in the middle, with a smooth-edged transition line between the dense and light areas. A ND filter with a soft-edged transition line is particularly useful for images that feature trees, buildings, mountains, and other features high above the horizon.
NiSi GND filters do not affect image coloration, offer true-to-life color and are made of high-quality optical glass (not resin) with nano coating to avoid losing any touch of detail. By using the ND filter, the camera is vulnerable to infrared light which will cast the unwanted red color to photos when shooting at a small aperture. NiSi GND filters have an infrared protection coating layer to eliminate infrared light through the lens to bring natural color back true to life.