<p>I'm wondering if anyone else has run into this strange problem. I was doing micro focus adjustment on my 7D Mark II and 70-200 f/4L lens. As the procedure progressed, the adjustment kept getting worse and worse, until I was dialing in +20 and it <em>still</em> wasn't happy. I know this is one of my sharpest lenses and I thought something must be wrong. I cleaned the contacts, checked to make sure IS was off, but nothing helped. I started going through the menus to see if there was anything strange there. I noticed the battery power was down to about 30%. Since I was grasping at straws at this point, I went ahead and put in a freshly charged battery. Bingo! The lens only required a modest adjustment after that. Weird!</p>