Rainbowimaging LCMX1B Self-Retaining Auto Open Close Lens Cap for Pentax MX-1 Camera (Black) This Silver lens cap opens and closes automatically with the extension and retraction of the lens. Without touching the lens cap, the camera responds instantly to sudden shutter opportunities by just turning on the power. Protect the lens with a lens cap that can't be lost or forgotten. Innovative design for Pentax MX-1 camera Camera for reference only!