If you take the C1 or the C2 don’t remember which one now it’s on the right-hand side underneath the controller if you hold it in and turn the wheel on the left-hand side it will zoom in and zoom out.
What you can do if you want the extra digital zoom is do it in your editing software, I use FXPX and it works fine, and if you use what is called the Ken Burns effect you can animate your digital zoom and Pan works very well.