The ND is a compact -one variable neutral density that adjusts the amount of light reduction with just the of your wrist. The index marks on the let you know exactly the amount of reduction . Giving you clear and precise shots at whichever density you are using. It is able to adjust neutral density freely from ND2 to ND400. You only need to carry one single with the same capability with ND2, ND4, ND8 ND16 ND32... and ND400. It offers you the create different neutral density freely. reduction numbers and transmittance thus generated can be applied for different conditions, such as , water falls, fountain etc. Feature - Color: Black - Material: plastic and glass - Size: 15 x 1.7 x 10cm - Double anti-reflective coating, only 7mm thickness ultra thin frame - Allows for variable light reduction from between 2-8 stops; protect your lens from and scratches - Decrease the depth of field by using wider apertures, which helps separate subjects from their background - Allows the use of slow shutter speeds, with high films or digital cameras, to record movement/ subjects such as waterfalls, clouds or any subject - To avoid vignetting at wide angle lens, this has a special front lens, the diameter of the front lens is larger than that of the rear lens Package list: 1 x nd