The SeaLife Lens Caddy mounts ANY SeaLife DC-Series lens to the camera tray using a standard 1/4-20 tripod screw or to any grip/arm up to 1.8" (45mm) in diameter using a sturdy hook & loop nylon strap. The lens securely pressure grips onto the Lens Caddy underwater or on land, the same way lenses attach to the lens port of your SeaLife camera.