Well done... On another note if your going to keep using the back AF button turn off your shutter half press in the menu as it can cause refocus when the shutter is pressed. Another way to use back button AF is to keep your camera in AF.C, a single press of the button hold for SR and release will lock the the focus allowing for recomposition and also using AE lock (which you can lock even with shutter half press). If there's motion holding the AF button down will track the subject or holding, focusing then releasing on a spot the subject will be works well as long as your depth of field is correct. It's a little tough at first to remember your not focusing with the shutter at first but after a short time most people find it allows easier versatility.
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