The Cokin P-Series 121 Graduated Neutral Density G2 Filter is a graduated neutral density filter that helps to specifically darken skies and other bright areas 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 density and clear areas. Neutral density filters do not affect the coloration of the image and the 0.9 density provides a 3 stop reduction in light from entering the lens.
Cokin filters are constructed from CR-39 organic glass and are notably light in weight, have a high resistance to shocks and drops, and provide optimum light transmission for high image quality. This filter measures 3.3 x 3.9" / 84 x 100mm and is compatible with the Cokin P filter holder.