This is one of the coolest new things I’ve seen in a very long time. Goto their website www.lytro.com and read about it. I can’t explain the science behind it. All I know, is you take a picture with it, no need to focus before taking the picture because when you get the picture back onto your computer, you click and pick the point you want in focus and it will focus there!!!! YES! You pick the focus point AFTER the picture is taken. Checkout their website. I can’t wait to get my hands on one of these.