"In the Canon camera menu, you’ll look for an option called “Shutter/AE Lock Button” and then in that menu you’ll see a whole host of options. The one you’re looking for is called “Metering Start / Meter + AF Start.” Could they have possibly made that any more confusing for us photographers? No… I think not."
"The following is a cheat sheet from the Canon Learning center where you’ll find the menu option on your Canon camera to set up back button focus. If your camera is not listed here, just poke around a bit and I’m sure you’ll find it easy enough."
EOS Rebel T3: C.Fn 7 (option 1 or 3) EOS Rebel T3i: C.Fn 9 (option 1 or 3) EOS 50D: C.Fn IV-1 (option 2 or 3) EOS 60D: C.Fn IV-1 (option 1, 2, 3, or 4) EOS 7D: C.Fn IV-1 (Custom Controls — Shutter, AF-ON, AEL buttons) EOS 5D Mark II: C.Fn IV-1 (option 2 or 3) EOS-1Ds Mark III: C.Fn IV-1 (option 2 or 3) EOS-1D Mark IV: C.Fn IV-1 (option 2 or 3)
"More advanced Canon cameras have a dedicated button on the back of the camera that will be the button used to activate the focus on the camera, and other Canon cameras (such as Canon Rebels, Canon 60D, etc) will use the AF-L, AE-L button as the button that will activate focus after this option is selected."
About Jim Harmer. Jim Harmer is the founder of Improve Photography, host of the popular Improve Photography Podcast, author, and complete photography geek.