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| p.1 #2 · Harsh lighting AF focusing issues (Canon Mark IV) |
I had the same issue with my 7D and while it does not focus to the level of the 1D series, here is what I did.
I did a total, hard reset of the camera. Took out the lithium memory battery and the camera battery and let it sit overnight. Replaced memory battery with a brand new battery. Reset the camera to default and then reset up my preferences. That seemed to clear up most of my focusing issues. I was shooting with a Sigma 120-300 and I added a nice UV filter to it and that seemed to help also.
Might want to check the Canon board for better help since many here do not use Canon.