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The Hoya Pro1 Digital ND64 Filter is a dark neutral density filter with a factor of 64, giving a 6-stop light reduction. This is a great filter for reducing shutter speeds to capture motion such as in water, foliage or people. For example, in bright daylight the slowest shutter speed possible without a filter could be 1/60 sec at f/22. By adding the Hoya Pro1 ND64 neutral density filter, the 6 stop reduction in light means a shutter speed of 1 sec would be possible. Another use of the ND64 would be controlling depth of field. With a strong ND64, a much wider aperture can be used. Wide apertures like f1.4 and f1.8 create a very shallow depth of field and have the effect of isolating the subject from the background, but may not be useable under very bright conditions. Using the Hoya Pro1 ND64 neutral density filter to reduce the light solves this problem.