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The Seven5 Big Stopper is a 75x90mm glass neutral density filter which reduces light transmission by 10 stops. This allows much longer shutter speeds so that anything which is moving in your image becomes blurred or ghost like. Subjects such as clouds, waterfalls, rivers and the sea work particularly well, and is useful for removing traffic and people from cityscapes. Alternatively it can allow a wide aperture to be selected with a high ISO setting.
http://bcove.me/sxun82gl|Big Stopper/Little Stopper
A reference card is supplied with the filter to help calculate exposure times. Take a meter reading without the filter, and then add 10 stops of exposure, so for example a metered exposure of a 30th of a second at f11 would need to be increased by 10 stops making a new exposure time of 32 seconds.