Eliminates overly bright & faded images.Enables slow shutter speeds to record movement in subjects such as waterfalls providing a silky smooth effect to flowing water Rotating ring between ND2-400 giving great versatility in changing light.Reduces the amount of light without affecting colour balance Allows the use of slow shutter speeds on high speed films or digital cameras to record movement/image blur in waterfalls, clouds or any fast moving subject.Slim rim design preventing wide angle vignetting, and the tough aviation aluminum frame ensuring durability 8-layer (multi-resistant coating) to help water and dust.Extra tough frame that ensures durability and prevents jamming Decreases depth of field by allowing a wider , helping to separate subjects from their background