To take a candid photo, the first step is not letting the other person know you have a camera. When they’re sleeping it’s easy, but what if you want candid shots in public? First, make a decision about what the shot is going to be whether it’s a headshot, ½ body shot, their full body with the background, whatever it is. Focus your camera for that distance ahead of time and then put your camera at your side. Take the picture, and walk away. If you’ve focused right, you more than likely got the shot you were after, there’s no need to look. Just walk away.