AllThingsD on the new camera that lets you focus after the picture is taken:

This $399 camera, also called Lytro, can do all this because it is a so-called light-field camera, which is based on a different technology from traditional digital cameras. In simple terms, it uses a modified sensor, plus proprietary software, to capture and process more, and different, information about the light hitting its lens than other cameras do. This includes the direction of light rays. The result is a richer picture file that software, on the camera and on a computer, can use to manipulate images in new ways. Lytro doesn’t even classify its camera by the familiar megapixel measure. Instead, the company says it has a resolution of 11 megarays—in other words, it can capture 11 million light rays.

Imagine what this will mean when this technology can capture motion video.

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