There seems to be two ways to make a subject change size. Either using a Zoom or changing the distance between the camera and the subject.
I suspect this is may be difficult for users of handheld cameras, but probably easy for with dolly based cams.
Can anyone point me to any examples where the two effects are used in conjunction (e.g. such that the main object remains the same size; but the background appears to move further away); and what is the effect called?