Not sure really where to start. Previously owned a 7d & coupled together with the 100-400 was fantastic & never missed focus in a1 servo on all 19 points. Have now changed to a 5D3 & am having problems with it focusing in A1 servo on the very outer focus points. It seems to drag & hunt whereas the 7d locked straight away.
Hoping it is something simple. All help greatly appreciated.
Kind regards, Kevin.