Quote Originally Posted by DavidEccleston View Post
Keep your 7D handy, or if the 7D sale is funding the full-frame, buy a 1.4X extender. Distant wildlife, and the occasional agility movie are the only uses my 7D sees these days, and I've got an ancient FF camera.
I do have a 1.4X, and I did forget that the 5D III does allow AF at f/8 since the firmware update in April... so that is an option. That was always reserved for 1D series bodies in the past.

Brant - Have you tried your 100-400mm with a Canon 1.4X on your 5D III?

Pat