Kenko or other non Canon Extension tubes
When Canon issued the 300D and EF-S lens they also cane out with a new version of the extension tubes to use with this lens. As I understand it (and I have never seen these tubes or know anyone who has), this was necessary to clear the deep back of the lens and that the old Canon brand tubes could not be used with the 18-55 but could be used on the camera with other EF lenses.
My question is whether the Kenko or any other non-Canon tubes can be used with the kit lens or if all were too narrow to allow the lens to mount so the new Canon tubes are the only way to go if you want to use the kit lens? Does anyone on this board actually own tubes and the 300D kit?