Portable, mobile, lightweight, removable, low cost, easy to manufacture, easy to ship, easy to transport, easy to store, and easy to use optical adapters that provides an effective means of videoconferencing over a mobile phone or other mobile device with a camera. Embodiments include landscape and portrait adapters that can be easily applied, used and removed while maintaining a professional and aesthetic appearance. Small mirrors within the optical adapter allow light from the front of the mobile device to enter the adapter and be conditioned and redirected into the built-in lens of the camera on the back of the mobile device. Novel embodiments include a lens reverser and/or a re-lens. Optical adapters also provide for self-imaging or surveillance. Various protective cases and adapter embodiments are configured to match specific mobile devices.