The Rapid ND Variable Neutral Density filter offers the density from ND4 (2 stops) to maximum ND1000 (10 stops)*. With only 8mm thick, Rapid ND is one of the thinnest variable ND in the market. Including the front screw thread which allow users to attach extra filter and lens cap. To ensure the precision of density, Rapid ND is equipped with a compact handle in the front filter ring that allows users to adjust the degree of density by rotation. Rapid ND has a dotted scale in between the minimum and maximum ND marks on the front ring for convenience in returning to previous settings. Main features of RAPID ND Guardian Multi Coating (GMC) combines an anti-reflection coating as well as a protective surface. Guardian coating provides water-repelling and anti-scratching abilities. Multi coating helps to reduce reflections effectively. Rapid Deploying Ring (RDR) - helps to increase the friction when holding it on hand and easily attaches it with the camera. Secure the Rapid ND to your camera and avoid dropping on the ground when detaching or attaching it. All Terrian Structure (ATS) - an unique filter ring structure to enhance the durability. Performing a relatively good weather-resistant performance which can prevent water, dust and the influence of humidity and temperature variation.