This Lens Cap for ATHENA 18mm T2.2 Cinema Lens from NiSi is a match for the lens cap that originally came with your lens. Made from aluminum, it is a durable cap that features a ridged edge for improved grip. A foam layer inside the cap protects the front of your lens from dust and scratches. Fluorescent paint on the cap shows the focal length of the lens, making it easy to keep your gear organized.