Lytro's second generation "Illum" light field camera doesn't have a conventional sensor. It has a 40 megaray light field sensor that records the colour, intensity and direction of every light ray entering the lens. This can then be manipulated to determine the perspective focal point of the image. It has a constant 30-250 f2 zoom lens. The final image is 5 megapixels. Read about it here and here.