Rotating ring between ND2-400 giving great versatility in changing light. Reduces the amount of light without affecting colour balance.ND filters can eliminates overly & washed-out images. Enables slow shutter speeds to record movement in subjects such as waterfalls providing a silky smooth effect to flowing water.Apply slow shutter speed under strong sunlight exposure.Simply rotate the ring of this filter, it offers 2 to 8 stops added density.Slim . Thin filters are essential for avoiding vignetting when at wider angles.Colour: blackMaterial: aviation aluminum + optical glassSize: 49mmPackage Contents:1 x ND FilterOnly the above package content, other products are not included.Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.