Hoya 72mm PROND 32 Neutral Density 5 Stop (1.5) ND Filter 1.5 ND filter darkens the image, allowing you to photograph with a longer shutter speed or wider aperture than normally required. Providing a 5-stop reduction, this filter allows you to control depth of field and convey movement more easily. Metallic ACCU-ND coating ensures color accuracy and consistency between different ProND filter grades. One-piece aluminum ring adds durability and rigidity for assured use and helps to prevent filter jamming. Constructed from clear optical glass for maintained image clarity.