Post-shoot refocusing requires a camera that captures thousands of separate paths of light. Plenoptic cameras have an array of micro-lenses on top of the image sensor; the R11 has 40,000. As light travels through those lenses, it fractures into 40,000 separate image fragments. Computer software decodes the files to compose a final image; adjusting the focus is as simple as moving an onscreen slider to tweak the depth of field. Photographers can also view two slightly different angles to create stereoscopic 3-D stills and video.