Thanks useful information: 
Always!!!Originally Posted by dulvariprestige
It's strange to think, but 9/10 times it's user error, but with the condition that the user doesn't fully undersand the underlying inner workings of the camera's focusing system.
With a sample image or two, and a 100% crop of the focus area, we can see if there is a user made error(in expectation) or if there is any issue with the camera/lens ability to focus accurately.
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