3D layers not affected by camera zoom in After Effects
In After Effects, make sure your Cineware effect on the Cinema4D track has the Project Settings --> Camera set to Comp Camera, as shown below:



This setting means that the camera in your After Effects comp will control the viewpoint of the object, instead of any camera in your Cinema 4D project (I think C4D creates a camera by default, even though you can't see it in the Objects panel, otherwise nothing would render).