Getting rid of the bars and watching something in the correct aspect ratio are two different things. Most widescreen TVs have several modes for stretching 4:3 material to fill up the screen, but most of them use some method of leaving the middle of the screen unstretched while stretching out the sides. If you can't tell the difference while you're in the "fish eye" mode, then more power to you. But at least realize that the only way to view a letterbox source in the correct aspect ratio is to watch it in normal "postage stamp" mode as pictured above, or to use zoom. All modes aside from the normal mode, be it "full", "zoom", or what have you, stretch the picture.