Smartphone photography, as other posts here over the last few days have proved, is becoming an art form in its own right. Mobile cameras are un-obtrusive, they let photographers create images with a real sense of narrative without affecting the scene they are capturing in the way a DSLR would. These images rely heavily on capturing an exact moment when the story is at its strongest – so it’s crucial for a great smartphone camera to react quickly. That’s why we created the world’s fastest autofocus in a smartphone, allowing the Xperia Z5 series cameras to react in a staggering 0.03 seconds. But how fast is that?