Download the new build.
The CoronaCameramod it's a little bit strange: you have to go to Camera rollout in the main renderer, turn on "Enable photographic..." and, now, the modifier works ;-) I don't know why Ondra wanted this )
But, remember: you aren't able to modifier the Exposure compensation in real time during the rendering, if you are using a CameraMod.
Another "problem" is that we don't have a "focus distance by target" in the Camera rollout. Only by number.
If you want to use a "focus distance by target" for now, the solution is use a CameraMod. I think Ondra have to add this option in the Camera rollout.