Frequently, when viewing documentaries I see the filmmakers shooting closeups of images in books, or pictures etc. The camera will zoom in, out, or pan, tilt, or whatever. How is this done? Is the camera being held by some sort of device held overhead and focusing down on the material that is laid out on a table? How is the material kept perfectly flat if the image is being shot from a book? Or is the material held against a wal and being shot with the camera being on a tripod? Thanks for any input on how this is done.