The light-field camera is a new piece of technology that will radically change the way we can take images, and potentially video, in the future. By using a micro-lens array in the plane of the CCD sensor, and relocating the chip to a distance equal to the focal length of the lenses, it is possible to detect both the intensity and direction of the incoming light rays. This means it is possible to post-process each image captured in order to alter the plane of focus. Furthermore, this technology enables multiple perspectives via parallax from a single picture. This video helps to describe the fundamental optical physics behind the technology soon to be released. The company that has produced the first of its kind—Lytro—is a spin-off project from research by Ren Ng, who obtained a PhD at Stanford University in 2006.