DEALING WITH OFF-CENTRE SUBJECTS
Having a single AF point active gives you excellent control over where the camera focuses, but you have to keep an eye on where the focus point is aimed. Generally, it’s a good idea to reset the focus point to the centre of the frame after each shot; some cameras let you dedicate this to a function button. Working in this manner means that you know instinctively where the focus point is as you bring the camera up to the eye, and you’re ready to move it to where you want it for the desired composition.