A convertible computer includes a transparent optical element in the keyboard base that provides light pass-through for the camera but does not interfere with the user's experience. The transparent optical element may include a transparent glass or plastic element that maintains the imaging specifications of the rear-facing camera. In some implementations, the transparent optical element can maintain the f-number of the optical system that includes the camera and the transparent optical element and may not affect image quality of images captured by the camera. In some arrangements, the transparent optical element can include an optical system that can increase the light-gathering ability of the camera (e.g., decreases f-number), effectively converting the camera lens into a macro lens. In other arrangements, the transparent optical element can include an optical system that can improve the imaging of distant objects (e.g., increases f-number), effectively converting the camera lens into a telephoto lens.