The Cokin Round Cine ND4 Filter is a high-quality screw filter specifically designed for use with lenses that have a diameter of 107 mm. This neutral density filter reduces the amount of light hitting the sensor or film to prevent overexposure while maintaining image quality. The ND4 filter provides a light reduction of 2 stops, making it ideal for shooting in bright lighting conditions. It allows for longer exposure times and better control over depth of field, which is particularly beneficial in film and photography. The filter is easy to attach and remove, ensuring flexible handling during shoots. With its robust construction and high optical clarity, the Cokin Round Cine ND4 Filter is a valuable addition to any photographic equipment.