Lee SW150 Mark II Solid ND Filter - Little Stopper (6 Stops)Our Stopper filters are used for extending exposure times which has the effect of making anything that is moving become blurred or ghost like, for example clouds, waterfalls, rivers or the sea. Used creatively, they can change the way we look at moving objects and capture a real sense of time passing in your images. Stoppers are not limited to landscapes and can be used to blur crowds of people, traffic, or anything in motion. Little Stopper 6 stops