I just want to know how much magnification there is... if I have a point and shoot camera and it has 10X zoom, I'm seeing that the subject is "brought" 10x closer. So, what does a dSLR telephoto lens need to be to bring the subject 10X closer? I am looking to buy a 55-200mm Sony lens - will the subject be approximately 10x closer? Or 5x closer or 15x closer?