A fisheye lens is a unique lens that produces a distorted, rounded image of the subjects in its viewfinder. There are several other terms that are used synonymously for a fisheye lens, including ultra-wide-angle lens, wide-angle lens, and 360-degree lens. The ultra-wide-angle is a lens that has a shorter focal length than a standard wide-angle lens and is typically used to capture vast landscapes or other broad subject areas. A wide-angle lens is a lens that captures a larger frame than a standard lens, ideal for fitting a lot into one shot. A 360-degree lens captures a complete spherical view of a scene, including everything above and below the camera.