The LEE Filters 100 x 150mm Medium-Edge Graduated Neutral Density 0.6 Filter is the ideal camera accessory that lets you reduce the exposure of sky in an landscape image. This neutral density filter is designed for 100mm System Filter Holder. It has a medium-edged line of transition that has a dense edge and clear middle, which allows you to filter the exposure of sky on the land without compromising on the coloration of the image. It has an up to 4x filter factor with 2-stop reduction in the exposure that enters the lens.