Using back-button focus (BBF) on your Canon camera
There are two ways to initiate (and lock) focus on your Canon DSLR
- using the shutter button, and / or
- using the AF-ON button on the back of the camera, near your thumb.
The AF-ON button can be set to be the only way to initiate focus, disallowing the shutter button from doing so. Depending on how you program Read more inside...