A friend of mine is offering a 80-300mm zoom lens at a good price for a 35 mm camera. Im not a total newbie, i kinda know how zoom lenses work, however i have one thing bugging me: afaik, the general rule for zoom lenses is that the magnitude of zoom = max foc. length/min foc. length or something like that. However, something tells me that the image projected at 80mm is 1.6 times bigger than the 50mm foc. length that is considered "normal" for 35mm cameras. So, 1.6*(300/80) is 6x zoom. Or is it 300/80=3.75