Back Story…

Our muscle memory is set-up so we expect focusing to happen when we press the shutter button. But while this does mean, as beginners, we will get more shots in focus (because we can’t forget to re-focus between shots) it’s far from ideal. There's a better way, and one that's used by most professional photographers.

Back to Basics - What IS BBF?

With risk of simply re-stating the question, it’s a camera setup technique where the focusing is enabled by a button on the back of the camera, rather than the shutter-release button. All DSLR and Mirrorless cameras support this technique, even smaller consumer DSLRs. 

Leica cameras work bit differently, so these are the only I’ve found that can’t be setup in exactly the same way, although they can be configured to get most the benefits. Besides, if you can afford a Leica camera, then you can afford someone to focus your camera for you!

Back up a moment - how do you set it up?

Setting up BBF is very easy. To enable this mode, there are three steps: