In the past couple of days, the tech and photography world has been abuzz with news of Lytro, the focus-free camera that promises to change how you take pictures forever. Lytro is the brainchild of a young Stanford Ph.D named Ren Ng. While the technology has existed since the mid-90s, Dr. Ng was able to take his award-winning dissertation research to adapt the imaging technique — "light field," which once meant some 100 cameras in a room — for consumer use. The basic premise of Lytro's technology is such: the camera captures every ray of light, deflecting off every object at every angle, in any given image. Where traditional camera lenses "simply add up all the light rays and record them as a single amount...