When composing your shots, you can take advantage of the Tap to Focus feature on your iPhone. Normally, the camera focuses on a subject in the center of the display, which you’re reminded of when you momentarily see a square appear in the middle of the screen. But if you tap elsewhere in the frame, perhaps on the face of your kid in the background, the iPhone accordingly shifts its focus there, adjusting the exposure and what photographers refer to as the white balance.