JimH wrote:
Here's the rub - the CANON teleconverters only fit EF style lenses, and of them, only "L" series, and some selected Non-"L" lenses. In other words, they don't even fit all the EF lenses. Therefore, you couldn't attach an EF-S lens to any of the CANON tele's. So the answer to your question is still NO, you can not go F/F Camera-->tele-->EF-S lens.
I do not know if any other 3-rd party converters will do what you want.
I saw a third party one on the web that stated it would accept EF or EF-S. That made curious if that combination would work. Someone else stated that if it was possible it would cause vinegting. But depending on what you were doing, I suppose that could potentially be cropped.