Aviticus, the best real world correlation I can think of is this: Focal length is like the distance between the lens and the film ( ever see one of those telephoto zoom lenses that stick way out in front of the camera? )After that you can still back-up or get closer to your subject with the whole camera in hand. There isn't really any real world correlation to 'scale' except that maybe if you have an itty bitty model by some itty bitty bugs and want a normal perspective view from some other itty bitty person, you can do in the virtual world something you can't do in real life and make your camera itty bitty too. Tho' most people just scale the models and leave the camera alone.