3) Use neutral-density filters. A must-have tool for daytime long exposures, an ND filter cuts the light coming through the lens, so you can open your shutter longer even on bright days. Its light blocking power is described in stops, usually between 3 and 9, so that an exposure you’d ordinarily set to 1/60 sec would be 1/4 sec using a 4-stop ND filter. For really long exposures, stack them up to 13 stops. High quality ND filters are the most color-neutral, but some inexpensive models can lend a muddy orange cast to color images—if that happens, convert to black-and-white.