To do this, you need to use the dolly camera instead of the main. Just right click in the preview window, and change the camera view to dolly. You will probably need to reposition it to the same place as the camera you've already placed in the scene, but it is - to the bestof my memory - the only camera that pivots on it's own axis, rather than being parented to the world centre or a given figure/body part.

hope this helps,

jonthecelt