The Lee 4x4 Inch Big Stopper is a high quality glass 10 stop long exposure filter. It reduces the amount of light entering your lens by 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 cityscapes to blur people or roads and freeways to blur traffic.
The BIG Stopper fits the standard LEE 100mm Filter Holder allowing it to be used on a number of different lenses as well as in conjunction with other filters such as neutral density graduated filters.
This is the construction of a type of filter. The type of process used to create a filter can affect its price. Filters can be constructed out of regular glass that sandwiches a coloured gel in between or in high-end filters, raw elements are added to the molten optical glass so there is no risk of uneven colour or fading.