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 55x200 sony lens - will the subject be apprx 10x closer or... 5x closer or 15x closer...?  that is all we're trying to find out...