The Cokin P Series Hard-Edge Graduated Fluorescent Red 0.3X Filter is designed for use with a Cokin P Series Filter Holder. It can be used to add fluorescent orange to a hazy or colorless sky. When used to enhance the sky within an image, the desired effect can be applied only to the sky, without any unwanted changes to any other part of the image. The filter is densest at the edge and tapers to clear by the middle, with a hard-edged line of transition between the dense and clear areas. This filter has up to a 0.3 density and reduces light from entering a lens by up to one and two-thirds of a stop. A graduated filter with a hard-edged line of transition is useful for images which include defined horizon lines. This filter is made of durable, optical resin (CR39) and measures 1.6mm thick.