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? Why does the LCD screen show 81 focus points when I press the multi-function Q button? How do I use Peak Focus to take a photo? How do I use the Manual Focus and Zoom Focus to take photo? Why doesn't the focus point fix to one place when I press the shutter button halfway down? Comments 0 comments Please sign in to leave a comment.