I was real interested in the 2X extender III , as I just purchased a Canon 7D with the 100-400mm lens. Unfortunately, I just received an email back from Canon stating that unless you have an EOS 1 series camera, this extender will not do autofocus. If you have a 1 series camera it works only on the center AF point. As a previous poster stated, the lenses that it works with are listed at the Canon website. Canon will begin shipping these in late December and probably will be available in January.
Log in Register
Your B&H Photo login also works for B&H Insights! After your first login you will be able to create a username.