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 bright & 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 angles. Colour: black Material: aviation aluminum + optical glass Size: 49mm Package Contents: 1 x ND Filter Only the above package content, other 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.