The Urth ND4 Plus 77mm lens filter provides a fixed 2-stop light reduction for enhanced photographic control in various lighting conditions. This circular filter enables photographers and cinematographers to achieve longer exposures and wider apertures without overexposure, making it ideal for motion blur effects and shallow depth of field techniques. Constructed from premium German B270 SCHOTT optical glass, the filter features 20 layers of nano-coating that ensure consistent light transmission while providing superior protection against water, oil, and scratches. The ultra-slim magnalium rim design prevents vignetting on wide-angle lenses, and the double-threaded construction allows for filter stacking while maintaining compatibility with standard screw-mount lens caps. With a diameter of 77mm, this neutral density filter reduces light transmission by precisely 2 f-stops, enabling photographers to slow shutter speeds for creative motion effects or open apertures for reduced depth of field in bright conditions. The advanced coating technology maintains color accuracy and minimizes reflections, ensuring optical performance remains uncompromised. Professional photographers value this filter for its precise light control capabilities in landscape, architectural, and portrait photography where exposure flexibility is essential. The durable construction and lifetime guarantee on the magnalium frame provide long-term reliability for demanding photographic applications. Proper installation involves placing the filter flat against the lens front element and turning clockwise until secure, taking care not to overtighten. This filter represents a practical solution for photographers seeking to expand their creative options while maintaining optical quality and equipment protection.