Well luckily it was only used to be a little doucher. anyway are you sure? we may be talking about different things with metering. I'm referring to using Av, Tv, etc, where the body controls exposure.
I don't do canon but nikon doesn't meter on non-communicating lenses (t mount, old manual lenses, un chipped lenses) and i'd be surprised if canon will meter a lens (outside of Av) that the body can't stop down.