Three passes, each doing only its own work. Barcode and panel fill in
what the product is; reference photos are what the cabinet
recognises it by later.
Live view
Turn the barrel until FOCUS stops
climbing. On a lens with a motor, this finds the sharpest setting and
pins it there.
Show the barcode and press Barcode. Then the back of the pack for Nutrition panel. Then the front, and press Reference photo six to eight times, turning the pack a little between each.