The lens needs to be calibrated
If your lens is focussing in front or back of the exact point of focus, your lens needs to be calibrated properly. Don’t be alarmed, this isn’t a serious issue and it can be rectified fast and easily. All the cameras come with a built-in process to re-calibrate the lens for that specific camera-lens combination. This is known as AF Micro Adjust or AF fine-tune feature.
Dirty auto-focus sensor
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