Canon EOSDigital Rebel XTi vs Canon EOS 5D camera comparison
Both EOSDigital Rebel XTi and EOS 5D have 2.5" lcd screen size.
Canon EOS 5D is able to produce nicer pictures since it has 12.8 megapixel picture quality, comparing to 10.1 megapixels at Canon EOSDigital Rebel XTi.
Canon EOSDigital Rebel XTi has optical zoom of 3x and Canon EOS 5D doesn't have any. For Canon EOS 5D you should buy special external lenses. You choose lenses by your needs and preferences. That is the characteristic of some professional models.