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The ND16 is a dark neutral density filter with a filter factor of 16, meaning there is 4 stop light loss. This is a great filters for slowing down shutter speeds to capture motion. An example: In daylight, maybe the slowest shutter speed possible without a filter could be 1/60 sec at F/22 By adding the HOYA PRO1 ND16, a shutter speed of 1/4 sec would be possible.