The Big Stopper, made by LEE Filters in the UK. This high-quality glass full ND filter provides a 10-stop reduction in light. By significantly increasing the exposure time, it can blur the movement of clouds, waterfalls, rivers, and the sea. It can also be used in urban landscape photography to blur people and cars. It is compatible with LEE Filters' 100mm wide filter holder and can be used in conjunction with other filters such as a graduated ND filter.