I don't feel the 70-200 is a great platform to start with to throw a 2x on top of it. Unless I had a poor copy I sold my 70-200 off quickly.
I do like the 70-200 alone. I also saw a video recently mentioning about the 2x being poor on the 70-200. but on a 100-400 it is good. I will be doing some more test shots and see how it turns out but I think it will have to go back :/











