I still think there is some clarification needed on this issue. I found another site that has a very similar discussion to what I was trying to show at thedigitalbits.
http://www.widescreenmuseum.com/special ... emptor.htm
The important thing is that letterbox and anamorphic look the same on a 4:3 set. But here's letterbox and anamorphic on a 16:9
letterbox:
anamorphic:
And the following text...
Image size is not the only difference. Clarity and detail are substantially better when DVDs are "enhanced for 16:9".
Remember that I mentioned that 16:9 gear can get rid of the black bars on the sides of 4:3 programs? By using the zoom feature we can make the little Spartacus picture the same size as the 16:9 version. I'd give you an example but I just can't convey what happens when you do that. It's an ugly thing to behold, at least if you have a relatively large screen. We're using a 100" screen and it's unlikely that Universal's DVD will ever be displayed on it. But don't take this as an attack on Universal. There are other bonehead transfers that just break your heart. As an example, Fox used 65mm elements of Oklahoma! and South Pacific as well as the 55.625mm negative of The King and I in order to produce high quality transfers, and then they used the cheesy 4:3 letterbox format to make DVDs. They're bloody awful to look at on a big screen system. Is it too late to ask for a refund?
So when I complain about letterbox, it's not because I don't want to see black bars. It's because I don't want bars on the side as well as the top/bottom, forcing me to zoom in and lose quality.