Thoroughly inspected by Toby.
The Hoya PRO ND1000 gray filter provides a light reduction of 10 stops. A shutter speed of 1/250 seconds is reduced by the filter for the lens to 4 seconds. With a ND1000 filter you turn your waterfalls into a white veil. But even the sea or a cloudy sky changes into a smeared hint due to the slow shutter speed. Various coatings prevent color changes and loss of contrast, so that the filter does not negatively affect the quality of your photos.