To take an image that is completely in focus, one of the most familiar parts of a camera—the lens—isn’t necessary anymore. Instead, a thin mask over the image sensor can do the job. But the kind of mask you use makes a huge difference in how sharp your image is.To take an image that is completely in focus, one of the most familiar parts of a camera—the lens—isn’t necessary anymore. Instead, a thin mask over the image sensor can do the job. But the kind of mask you use makes a huge difference in how sharp your image is.[#item_full_content]