In aspects of telephoto camera viewfinder, a multi-camera device has a digital camera to capture a digital image of a camera scene as viewable with the digital camera in a wide view. The multi-camera device also has a telephoto camera to capture digital content of the camera scene as viewable with the telephoto camera in a zoom view. The multi-camera device has a display screen to display a viewfinder user interface that includes the zoom view displayed as a zoom preview image captured by the telephoto camera, and the wide view displayed as a camera preview image captured by the digital camera. The viewfinder user interface also includes, displayed over the camera preview image, a bordered outline of a region of the camera scene that indicates the zoom view relative to the wide view of the camera scene.