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. 8layer (multiresistant coating) to and dust. Extra that ensures durability and prevents jamming. Rotating ring between ND2400 giving great versatility in changing light. Reduces the amount of light without affecting colour balance. Decreases depth of field by allowing a wider aperture, helping to separate subjects from their background. Allows the use of slow shutter speeds on high speed films or digital cameras to record movement/image waterfalls, clouds or moving subject. preventing wide angle vignetting, and the tough aviation aluminum frame ensuring durability.