Cokin P121S Cokin Grad. Neutral Grey G2-SOFT ND8 0.9 Filter.Cokin graduated gray ND filters are part clear, part neutral density. They allow the transition to be blended into the scene, often imperceptibly.A ND.6-to-clear, with a two stop differential, will generally compensate the average bright sky-to-foreground situation and is also the most popular density of the series. This filter measures 85 x 85mm and fits the Cokin P series holder.