Getting your firmware right

The hard work for enabling lens control and so on was done in the userland library. The way to get 100% bleeding-edge userland libraries is to download and compile it yourself, which takes about 15 mins on a Pi 3:

git clone https://github.com/raspberrypi/userland.git
cd userland
./buildme

However, it turns out there is a helpful repository of binary firmware and that you can use the excellent rpi-update to install it. That is now what I recommend in the readme - in fact, you can install the "stable" version of the firmware as it now includes the necessary features.