In the majority of portraiture, the subject’s eyes are the main focus of the shot, and it’s therefore important to ensure they are sharp, especially when using a wide aperture. By default, your camera’s autofocus system will usually focus on whatever is in the centre of the frame, or closest to the camera. As a result, when your subject is positioned off-centre or behind foreground elements, you will end up with a blurred subject if you rely on the default …