anthony_r.1 Posted April 16, 2015 Share Posted April 16, 2015 <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> Link to comment Share on other sites More sharing options...
brano_k Posted April 16, 2015 Share Posted April 16, 2015 You did not try to put half empty battery back again and redo the extreme focus corredtion? That would answer the question: Was it a "reset" of camera or that MF adjustment requires juicy battery. Link to comment Share on other sites More sharing options...
anthony_r.1 Posted April 16, 2015 Author Share Posted April 16, 2015 <p>I thought it was so strange I didn't even think of doing that. But I will try it again when the battery drains back down.</p> Link to comment Share on other sites More sharing options...
Marcus Ian Posted April 17, 2015 Share Posted April 17, 2015 <p>MFA should NOT require a full battery. As long as there is enough juice for the camera to function properly, there should be no effect on MFA. </p> <p>MFA is also supposed to be non-volatile (so you don't have to redo it everytime you put in a new battery). However, you were clearly experiencing a problem that was apparently resolved by switching batteries. I've got to admit, my best guess would be that there was some sort of firmware glitch, and it was resolved when you 'turn(ed) it off and back on again' the hard way (by replacing the battery). I would also guess that if you had simply removed and reseated the main battery (even @ 30%), it would have resolved the problem as well.</p> Link to comment Share on other sites More sharing options...
anthony_r.1 Posted April 17, 2015 Author Share Posted April 17, 2015 <p>I tried it again with a battery down to about 25% and it worked fine. I suppose it was gremlins. Anyway, I as just wondering if anyone else had experienced anything similar.</p> Link to comment Share on other sites More sharing options...
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