The Urth 40.5mm ND16 (4 Stop) lens filter is a high-quality neutral density filter designed specifically for photographers and videographers who seek precise control over the exposure of their shots. With a diameter of 40.5 millimeters, this screw-on filter is easy to attach and fits a variety of lenses. The ND16 filter reduces the amount of light hitting the sensor by four stops, allowing for longer exposure times in bright lighting conditions or wider aperture settings to achieve a shallow depth of field. This is particularly useful for capturing motion, such as flowing water or moving subjects, as it creates a smooth, blurred motion effect. The filter is made from high-quality materials to ensure optimal image quality and minimize unwanted reflections. It is a valuable addition to any photography or videography kit, offering creative opportunities to enhance image composition.