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If you're shooting on Mate 10, go aperture mode and set to highest value. no background blur.

edit: I tried it on my phone, go pro mode and go manual focus set focus to landscape mode

Ooo... Ok. Let me try that.

This is what I got
IMG_20180315_071709.jpg

Maybe your son's hand position as well. Too far from the lens.

Try ko ulet yun long distance

try lng ng try :)