This filter is a combination between a Neutral Density Grad 0.6 Hard Edge and an Autumn 2 Grad. The Autumn color graduated filter is double filter blending tobac and yellow to enhance color of foliage. Soft edge grads have a smooth transition from clear to ND. The ND Grad portion is primarily used for light reduction in skylines of landscape shots. The hard edge has a more defined hard lined transition and is usually used for longer focal lengths. The 0.6 filter reduces light by 2 stops. Formatt-Hitech filters are made from the highest quality 1.5mm optical resin.