iPhone 5 camera: green spot?

Hi there,

I have bought an iPhone 5 yesterday and today I have been testing the device thoroughly and I have noticed something weird that I haven't seen before on any of my previous iPhones.

If you take a closer look at the picture below, you'll notice a green spot right in the middle of a purple 'halo'. I have read about the halo and it appears that it is normal. However, the green spot seems a bit awkward to me. :D



Am I overly worried and can the green spot be considered as normal? It only appears during light intensive situations.