The Lytro camera lets you focus photos after you’ve taken them. With no need to auto-focus, images can be captured instantly and later sharpened up, shifted in perspective or manipulated in 3D space. Born out of inventor Ren Ng’s PhD from the University of Stanford, the Lytro condenses the principles of light-field photography into a handheld consumer device. It could be the first step in a potentially major shake-up in photography. Here’s a deeper look inside.