The WoW 3.3.5a client only lets the camera pull back a short way, draws terrain out to about 791 yards and drowns the rest in fog. For screenshots and for keeping a whole fight or landscape in view, that is far too little.
wxl-maxzoom takes all three limits off: camera way out, view distance to the horizon, distance fog off. Everything adjustable live while you are in the game. It is a module for WarcraftXL, so it hooks into the client rather than the server.