Systems and methods are disclosed herein that generally involve a camera system including a high-quality lens which is selectively attachable to a mobile device, effectively replacing the mobile device's integral lens. The attachable camera system can leverage existing features of the mobile device, such as the display, battery, storage, and sharing functions, allowing the camera system itself to be a relatively simple, lightweight, portable, and inexpensive device. The ability to selectively attach and detach the camera system from the mobile device allows the camera system to be removed when it is desired to maintain the mobile device's favorable weight, size, and ergonomic characteristics. When high quality image or video capture or increased camera flexibility and functionality is desired, the camera system can be attached to the mobile device.