The lee 75x90mm seven5 little stopper is designed for long exposure photography and reduces the light entering the lens by up to 6 f stops the little stopper is ideal for low light conditions at the beginning and end of the day when the big stoppers ten stops may prove too much allowing you to enjoy increased flexibility with exposure lengths by increasing the length of exposure time the little stopper adds a ghostly time passing effect of anything that moves eg sea clouds waterfall