This Kase 150 x 170mm Wolverine Soft-Edge Graduated ND 1.2 Filter is compatible with a Kase 150mm Filter Holder or other filter holders that can accommodate 150mm-wide, 2mm-thick filters. It helps to 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 able to filter the sky while minimizing its effect on the land. It is particularly useful where the transition between sky and foreground is indeterminate, such as images featuring mist, fog, or the tops of trees. Neutral density filters do not affect the coloration of the image and this filter provides up to a 4-stop reduction in light from entering a lens.