addie writes: A Silicon Valley start-up is set to change the way we take photos. Later this year, Lytro will release a camera that lets you shoot now and focus later.... The company does this with an innovative sensor called a light field sensor. The light field sensor takes in three pieces of data about each ray of light: its color, intensity and direction. Conventional camera sensors just add up all the light rays and record them as one amount of light instead of recording information about each ray.