The Big Stopper is a high quality glass 10 stop long exposure filter.
It reduces the amount of light entering your lens by approximately 10 stops allowing you to use a much slower shutter speed or wider lens aperture.
By greatly extending exposure times the BIG Stopper has the effect of allowing anything that is moving in your image to become blurred or ghost like, for example, clouds, waterfalls, rivers, and the sea.
However the effect is not limited to landscapes, the filter can be used on city scapes to blur people or roads and motorways to blur traffic.