Hoya 82mm PROND 4 Neutral Density ND Filter 2 Stops (0.6) Exclusive Hoya ACCU-ND technology ensures accurate color balance when switching between ProND filters Filter provides X amount of neutral density stops (depending on the filter you can insert X-see press release) Super high quality Hoya Clear optical glass Assembled using a one-piece aluminum frame creating a rigid, durable, but lightweight filter Perfect for Still and Video applications