The kenko 77mm smart filter kit consists of 3 kenko filters a protector circular polariser and nd8 the clear protector filter is used for general protection of the lens and is made with high quality multi coated glass the circular polariser adds a polarisation effect to eliminate unwanted reflections or to enhance saturation and contrast of the sky and is an essential tool for landscape photographers lastly the nd8 neutral density is designed to decrease the volume of light coming throug