Which areas of the screen can set off the shutter when touched? When the aspect ratio is 4:3 or 3:2 or 16:9, you could touch the area covered by the 81 AF points to set off the shutter. When the aspect ratio is 1:1, you can touch the area covered by the 63 AF points to set off the shutter. Related articles Why is focusing at night difficult? How do I use Peak Focus to take a photo? Why does the LCD screen show 81 focus points when I press the multi-function Q button? Why doesn't the focus point fix to one place when I press the shutter button halfway down? When do I use HDR? Comments 0 comments Please sign in to leave a comment.