Designed for photographers looking to shoot long-exposure photography, the Cokin Z-Pro Full ND Kit is comprised of 3 popular neutral density filters: ND2 filter X152 (1-stop); ND4 filter X153 (2-stop); & ND8 filter X154 (3-stop). These filters reduce the amount of light reaching the sensor, & can be used alongside a long shutter speed to experiment with distance & depth of field.