"The 2d tools, (Hand tool, Zoom tool, etc.,) SHOULD NOT be used in a CAMERA view. They are for use in a 2d view. (Front, Right, Left, Top, Bottom, Rear.) The CAMERA tools should be used to maneuver the camera. Dolly and Track. The Track tool has 3 different directions it can be used to properly position the camera in your scene. The Dolly tool allows you to spin around the chosen object. "

Actually, for the case that is being discussed here you are 100% incorrect. This person lost a portion of the production frame. They could not see the corners of it in their camera view window to manually resize it. Using the camera tools would not work. No amount of panning, zooming or using the track ball would move the production frame back into view because the camera tools to not effect the position of the production frame. To do that you'd need to use the hand tool. Using the hand tool allows you to move the window's entire contents around (production frame and all) inside the window. Once the production frame is back in view you would then use the camera tools to position your scene (or the portion of it you want to render) within the confines of the production frame. I would not recommend ever using the magnifying glass in the camera window but using the hand tool in this case is perfectly acceptable. In fact, it's a smarter and easier way to do it than having to go back into the render room, uncheck "keep proportions", type in a new size and then return to the assemble room to move the now visible corners of the production frame.

But hey, thanks for the public disservice announcement.;-)