77mm Pro Series Snap On Lens Cap For Pentax Zoom Super Wide-Telephoto SMCP-DA 16-50mm f/2.8 ED AL (IF) SDM Autofocus Lens, Pentax Zoom Super Wide Angle SMCP-DA 12-24mm f/4 ED AL (IF) Autofocus Lens This lens cap protects lens surface from dust & shock during storage. Unique snap on design allows easy installation onto the lens & one-step removal from the lens. It fits directly onto the lens with a double-action spring design. Microfiber Cloth 77mm Snap On Lens Cap