#1	This PRO ND4ND8 ND16filter reduce the amount of light entering the lens so Wider apertures can be selected which is perfect for portraiture to reduce depth of field
#2	Subject appears crisp and clear while the background becomes a soft blur Also Widely used for photographs of waterfalls and other nature scenes to emphasize movement
#3	Also Widely used for photographs of waterfalls and other nature scenes to emphasize movement