A lot of common sense written in this thread, I suspect an awful lot of unhappy 7D MK2 customers who sent their cameras back as being faulty didn't take the time and effort to read the 500 page manual. However I know of at least two excellent experienced photographers who did have genuine focus issues
When I first got the 7D MK2 three weeks ago I plugged in my 300mm f2.8 MK 2 and took some static shots. They seemed a little soft wide open at f2.8-f.4 . An aperture of f5 -f8 would have hidden the fact it needed AF Micro adjusted. It was front focusing so, +6 and it was in focus as it should be. Next BIF shots in AI SERVO were proving inconsistently soft, which was puzzling me ? I tried all the case options, and IS 2 and IS 3 mode on the lens for panning (2) and erratic movement (3). Still inconsistent ! So, I went down to the local duck pond today in mostly dull light to try and solve the problem Now the 300mm f2.8 mk2 is the fastest and sharpest lens in the world, no doubt about that so was the camera the culprit? I blame myself, having taken thousands of BIF shots with my ID Mk4 , 95% of which were razor sharp, I thought, go back to default case setting (1). This improved consistency a lot, I then took 100 RAW shots in total but only 60 were as sharp as they should be. So, with case setting 1, first image priority=focus, second image priority= middle setting, half way between focus and speed priority I then did what you should always do before pressing the shutter button, wait till focus and tracking is locked. This takes 0.5 secs on the 1D MK4 and takes about 1 sec on the 7D MK2. Basically I was used to the 1D and had to wait longer for the 7D to focus and track lock. Every shot I took subsequently was in focus as it should be using a 300mm f2.8 lens. Canon advised a friend of mine to ease off on the camera case tracking settings, 0 or -1,-2 , never + when using a fast prime lens. Canon also advise that case setting 1 the default setting may be all you will ever need, looks like they are right!
Two testing shots of fast birds below taken as RAW
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