02-10-2019 08:25 AM
Solved! Go to Solution.
02-10-2019 10:26 AM
The camera actually has two independent AF systems. One for Liveview and one for the optical viewfinder.
Does the problem also happen when using the Auto Focus through the viewfinder?
If they are both giving not working properly I would assume it is the lens that is causing the problem, not the camera.
If the optical viewfinder AF is okay, then you can eliminate the lens as a problem and concentrate trying to fix the Liveview AF.
02-10-2019 11:15 AM
I just tested to use autofocus when using the viewfinder but neither did it work there. However, I discovered something weird when doing that. The very right autofocusing point was blinking red even though it clearly wasn't focused there. I tried to point that specific AF point to objects close and far away, but it always said it was in focus. The lens didn't rotate a single degree. Maybe there's something wrong with that AF point?
02-10-2019 05:35 PM
The least expensive option is to try a new Canon battery. Does it focus correctly when the battery is right out of the charger, fully charged? It may be not able to hold a charge for a reasonable period or for those times when it is just sitting idle and does not have the power to run the lens.
02-10-2019 08:58 PM
I suspect that the AF motors could be misaligned and jammed up.
That link describes a solution for the older EF-S 18-55mm lenses. The older lenses do not have manual focus override. It is all too easy to reach up to turn the zoom ring while looking through the viewfinder, but actually turn the focus ring, which can cause the AF motors to become jammed.
The newer “STM” lenses do not suffer from this problem., because their focus rings have manual focus override. One dead giveaway that this could be the issue with your lens is that if you detach the lens from the camera and shake it, you will probably hear a faint rattle.