Yes, you can and I didn’t know it.
My good friend @mamadougsakho tipped me off yesterday and I want to share it with you because it’s really useful.
Go to the camera mode
. When the iPhone is idle, touch the home button and lift the camera icon from the bottom right to the top to reveal the camera mode
. Or walk your way through you iPhone to switch the camera on
In the camera mode, aim at your subject and
. Focus on the subject, by tapping the subject, a yellow square will appear and the subject will be sharper
. Optimize the light (brighter or darker), aim at the subject and tap it, leave you finger on it and see a little sun appearing. Then slide up and down to brighten or to darken the picture
Can’t be easier.