Teleconverters and autofocus: What every wildlife photographer should know

Canon 60d autofocus teleconverter

I received the following question via email and thought I should write a post here on to answer the question for the world. ┬áHere’s the question: “I’m looking at buying a teleconverter for my Canon 100-400mm L f/4-5.6 IS lens but I am having difficulty determining if the1.4x or 2.0x teleconverter will still allow CONTINUE