The Urth 40.5 mm UV lens filter is a high-quality screw filter specifically designed for use with lenses that have a diameter of 40.5 millimeters. This UV filter primarily serves to reduce ultraviolet radiation, which can cause a bluish tint in photography. By using this filter, image quality is improved, especially in outdoor shots where UV rays are more intense. The filter also protects the lens from dust, scratches, and other environmental influences, thereby extending the lifespan of the lens. The filter is easily mounted by screwing it onto the lens, ensuring user-friendly handling. The Urth UV lens filter is a sensible addition for photographers who value clear and color-accurate images while also wanting to protect their equipment.