Lee Filters
Seven5 Big Stopper
75×90mm Neutral Density filter
The Lee Seven5 Big Stopper for use with the Lee Seven5 Filter Holder is a long exposure filter that reduces the amount of light entering through your lens by approximately ten stops. By increasing your exposure time you can make anything that is moving in the image appear blurred or ghostlike eg clouds, waterfalls, people or traffic.
The Big Stopper can be used with other Lee filters such as ND Grads - keep the slot in the filter holder nearest the lens free for the Big Stopper.