You have to jog around your own neighborhood before you’re ready to run a marathon!

From Lytro team on

http://support.lytro.com/entries/20566151-can-i-buy-a-lytro-camera-even-if-i-don-t-live-in-the-usa

This is a surprise

Do custom initialisation in ViewDidLoad of a ViewController

There is no such thing as NSFloat

You cannot just add one NSNumber to another.

Here is the example of how-to: