The Urth 39mm ND64 1000 (6 10 Stop) Variable ND Lens Filter is a high-quality screw filter designed specifically for photographers and videographers who seek precise control over the exposure of their shots. With a filter strength of ND1000, this neutral density filter allows for a reduction of light by up to 10 stops, making it ideal for achieving longer exposure times in bright lighting conditions or opening the aperture without risking overexposed images. The filter has a diameter of 39 millimeters, making it suitable for a variety of lenses. The variable ND function allows for flexible adjustment of the light amount, which is particularly useful for creating creative effects, such as blurring motion or producing smooth water surfaces. The Urth ND filter is a valuable addition to any photo or video equipment, offering ease of use and high optical quality.