The lee seven5 neutral density 09 standard filter is designed to reduce the amount of light reaching the sensor by up to 3 stops without affecting the overall colour balance the reduction of light across the entire frame allows the use of slower shutter speeds to record the movement of objects such as water clouds people cars etc nd filters can be stacked together or used with other filters so you can respond to almost any lighting condition the lee seven5 neutral density 09 is 75x9