I've had a Canon r10 for 2 years or so now and frequently, since I got it, it has trouble finding focus. One time it'll be able to find a single bird in flight, and others it can't focus on a cardboard box sitting on a well lit table. It struggles the most in spot focus, but all are similarly terrible.
My father-in-law was sitting 10' from me, completely still, in a decently lit room, and it would not focus on his face. It just zooms through the autofocus range and settles on the red square. You can see the behavior in this video where I'm trying to focus on different things around the room... And it can't get any of these. I have cleaned the contacts for the lens and camera. Tried different lenses, including ef lenses with an adapter, different sd cards, and every autofocus setting I could find.
Pertinent settings:
AF operation: One shot (tried servo but fails in the same way)
AF area: spot is the worst. Whole area finds a focal point almost every time, but obviously is not always the focal point I want. All the other AF areas behave very similarly to spot, though find it slightly more often.
Subject tracking: tried on and off. Seemingly no difference. Same with subject detection, eye detection
AF-assist beam firing: currently on, but also toggled with seemingly no difference.
Lens drive when AF impossible: On
I initially made excuses thinking it was always not well lit enough, or subject moving or something, but I honestly think I just got a lemon. Any suggestions on other settings I might not have tried? I'm going on a bit trip tomorrow and sadly probably going to leave it behind and take my old T2i because at least it's reliable.
