Kase 150 x 170mm Wolverine Reverse-Graduated ND 0.9 Filter (3-Stop)

Kase 150 x 170mm Wolverine Reverse-Graduated ND 0.9 Filter (3-Stop) This Kase 150 x 170mm Wolverine Reverse-Graduated ND 0.9 Filter is compatible with a Kase 150 x 170mm Filter Holder or other filter holders that can accommodate 150mm-wide, 2mm-thick filters. It can be applied to darken bright skies, specifically during a sunrise or sunset, while allowing for a normal, unaffected exposure in the other regions of the image. This filter achieves its effect with a 0.9 band of density above its center region that provides up to a 3-stop reduction in light from entering a lens. This band extends in both vertical directions and tapers to approximately a 0.3 density and a 1-stop reduction in light at the edge above it. Directly below the 0.9 band of density, it tapers to clear, with a hard-edged line of transition before the clear area.