Hi all, if you have this setup and you confirm if I'm getting similar results to you or not?
I've had the 2x TC for a while but not been happy with the AF that I'm getting. I got it initially to shoot cricket however nearly every shot was back focused. I didn't do anything with it for a while and again went out to play this weekend and again got similar results. When the subject is closer it seems to be happier but not always accurate. If I MF the lens or actually what I do is focus on single shot and then tweak it to bring the focus forwards I get a nice result. I've noticed the same problem with the 2x TC on the Sigma 70-200mm f2.8 and I'm trying to get to the bottom of it.
Any ideas as everything seems fine when using my Sigma 1.4x TC on either lens. What have your experiences been?