Here are a couple of guides you might find usefull


[View:http://learn.usa.canon.com/app/pdfs/quickguides/CDLC_EOS7D_AF_Modes_QuickGuide.pdf]





[View:http://learn.usa.canon.com/app/pdfs/quickguides/CDLC_Accurate_EOS_AF_QuickGuide.pdf]


The bush you posted isn't moving, so I guess you are saying that it does this on stationary objects to.