One of the greatest benefits of back button focus is the ability to combine manual focus, single, and continuous focusing modes together. ... Single focus mode is good for subjects that are not moving too much. It allows you to lock the focus and then recompose the shot before firing the shutter.

What is the point of back button focusing?

Back-button focus is a camera technique that separates focusing and shutter release to two separate buttons. It is a useful way to stop the camera's autofocus system from getting continuously engaged when the shutter is released.

Is back button focus really better?

There are a number of different reasons to use back button focusing, but they all come down to one big reason: efficiency. While back button focus can help you to avoid focusing errors, it doesn't make your autofocus system capture sharper shots — but it does help you shoot more efficiently.