The AF works on my 70D in live mode with the 2Xextender, otherwise its manual focus only, the edges are soft when you have the zoom wide open, bad in low light situations, not a great combination in my view.
Man I glad I read this, I have a Canon 70D I was using with a new 1 to 400 mm EF lens along with a EF 2X loll extender, the Canon tech told me I would have to manually focus with it, so I have been with some real good results most of the time, I trie...
