The ability to focus afterwards is at the tradeoff of image size and quality, assuming they use a microlens array similar to the study located here: http://grap

The ability to focus afterwards is at the tradeoff of image size and quality, assuming they use a microlens array similar to the study located here: http://graphics.stanford.edu/papers/lfcamera/ http://graphics.stanford.edu/papers/lfcamera/. However, this is cleverly marketed towards the social media crowd, which has little use for high resolution photos.