The NiSi 75 x 100mm Nano Soft-Edge Graduated IRND 0.9 Filter is compatible with the NiSi M75 Filter Holder or other filter holders that can accommodate 2mm-thick, 75 x 100mm rectangular filters. It helps darken specific areas of an image, such as bright skies, while allowing for a normal, unaffected exposure in the other regions of the image. The filter is densest at the edge and tapers to clear by the middle, with a soft-edged line of transition between the dense and clear areas. A neutral density filter with a soft-edged line of transition is particularly useful for images that do not have a strongly defined transition between the sky and the foreground. Neutral density filters do not affect the coloration of the image and this filter provides up to a 3-stop reduction in light from entering the lens.