Have you ever used a nice big aperture and got home only to find out the focus isn’t on the part you wanted? Or done a portrait and their ears are nice and sharp not their eyes?
If so, you might have a lens focusing issue. There are ways to test for that and depending on your camera model you may be able to adjust it.
I found a video where the host walks you through the process of fine tuning autofocus for your DSLR. I think her accent is great and I love knowing that people around the world have the same issues and there are great photographers and educators everywhere.
Hopefully that solved your issues and everything is tack sharp now, exactly where you want it.
