Err...I don't think there is one?

There is, the F mount is pretty easy to convert to EF/EF-S. The reverse is, afaik, slightly harder, but pretty much every system has an F mount adapter for it—a combination of the mount's simplicity and the fact that it's been unchanged for 40-odd years (so there are zillions of cheap lenses to pick up for it) makes it a desirable prospect.
Lots of people use the 14-24 on their Canon bodies, for example![]()
