take a pic of a barcode at 45 degree , its easier to tell, your letters are too big for this purpose also let camera display focus point, the place where you thought you focused might not the placed camera actually focused due to vibration etc
【在 D**1 的大作中提到】 : take a pic of a barcode at 45 degree , its easier to tell, your letters are : too big for this purpose : also let camera display focus point, the place where you thought you : focused might not the placed camera actually focused due to vibration etc