Sorry just making sure this was at 70mm. Is there a reason you took 4 more shots with plus 1? I'd probably go plus 1.. I have heard, although not tested my self, that focus accuracy will change with hot/cold temperature changes.


Its really hard to say. Where do you normally focus on a persons face? If you are focusing on anywhere other than their eye, I would go with the setting that has a stronger bias towards back focusing. If you focus on the eye then go the opposite. Hope I didn't get that backwards but you get the idea.