The lens manual states I should be able to a/f with these new lenses using single point focus. I can't seem to get it to work (tried full auto -grn box - and P modes). I want a/f for fast moving wild life shots (I.e. birds). I have a 7D body.
Thanks, I appreciate the responses. I'm just getting back into photography after a couple of decades. I understand the issue and will have to either revert to the 100-400 for those fast action shots, or learn to manually focus (i.e. improve my skill)...
