Which areas of the screen can set off the shutter when touched? Tyler Updated January 24, 2017 22:52 Follow 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 the Manual Focus and Zoom Focus to take photo? Comments 0 comments Please sign in to leave a comment.