I have had no problems using the lenses from my Rebel G on my Rebel XT. Granted I don't have many lenses, but I have had no problems. I put them side by side (same lens, same settings) when I first got the XT to see the differences. THe biggest differences I saw as far as what was actually in the frame were on the close shots. Also you really do have to get used to the way the lens behaves on the XT, it is different but it is not difficult.