Quote Originally Posted by Kayaker72 View Post
Is anyone using this combination? Do you like it? In addition to the autofocus issues (needs to have f/8 to autofocus), I am finding the shots straight out of the 5DIII to be close to or better than those taken with the 1.4 TC. I am wondering if the 1.4 TC doesn't degrade the IQ much of better glass (70-200 IS II, big whites, etc), but does in the 100-400 L.
It degrades them all, but the big whites just start out so much better than the 100-400L that you wouldn't notice it as much.
http://www.the-digital-picture.com/R...mp=7&APIComp=0

I was not happy with the 100-400mm plus convertors. Smaller prints it would probably be ok.