I switched to using back button focusing about a year ago and now I never want to go back. [Sean]
From the Canon Austalia YouTube Channel:
Learn how to back button focus with this step-by-step video guide by Canon Collective Ambassador, Kass Brumley. With this video guide, you will learn how back-button focus works, use cases and how to set it up on a Canon EOS 5D Mark IV and similar models.
These are the key steps to follow in order to set back-button focus:
Step 1: Disable Autofocussing from the Shutter Button – 1:53
Step 2: Select ‘Metering Start’ – 2:13
Step 3: Assign Your AF-ON Button – 2:33
Step 4: Select a Focussing Mode – 2:53
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