The Urth 39mm ND8 128 (3 7 Stop) Variable ND Lens Filter is a high-quality screw filter designed specifically for photographers and videographers who seek precise control over their exposure. With a diameter of 39 millimeters, this filter is ideal for a variety of lenses and allows for the reduction of the amount of light hitting the sensor. The ND8 128 filter offers a variable density, enabling exposure reduction of up to 7 stops. This is particularly useful in bright environments or when using long exposure times to create motion blur or to open the aperture without risking overexposed images. The filter is made from high-quality materials to ensure optimal image quality and minimize unwanted reflections. With this filter, creative effects can be achieved while maintaining image sharpness and color reproduction. The Urth ND filter is thus an essential tool for anyone looking to enhance their photographic and cinematic skills.