The reason I use the Sony for 4:3 is that when my Sony Wega rear projection LCD TV gets a 720p or 1081i input signal, it seems to assume the material is widescreen and stretches the 4:3 picture to widescreen. The TV's width control doesn't allow changing the aspect ratio for 720p or 1080i signals -it's locked at wide. So I can't upconvert 4:3 material unless I want to watch a stretched picture (I don't).
Of course I could change the Zenith's upconversion setting to not upconvert when playing 4:3 material but its upconversion control is on the front of the unit and not on the remote control. It's a nuisance to toggle thru the upconversion settings on the front of the Zenith everytime I play a 4:3 DVD. The unit takes several seconds for each toggle between 720p, 1080i and 480p. The Sony player doesn't upconvert, so the TV plays the right aspect ratio for 4:3 material.
Which Oppo do you have? Does its remote control allow toggling the upconversion setting?
