Hi jorari71.
Yes I'm from spain :) but I speak english here to respect anyone else.
Well it's like romullus says, it works just like a real camera, you don't have to override the focus distance value, you can adjust it adjusting the target distance, with a free camera you have the value in the camera values, but with targeted camera that distance is defined by the camera target.
As for the rest of settings, it should owrk like any real camera, you can use the calculator values and it should work perfectly :)
Cheers!