EOS 7D autofocus doesn't hold target

Noob here. I've read the manual and checked Google as much as I can, but I'm unable to solve this simple problem. Just bought a used 7D and can't seem to figure out how to have it stay locked on a target as I recompose the shot. When I half-depress the shutter button it focuses, but when I move the target it changes focus to whatever else was in that focal area. I've tried going into 'C.FnIII: Autofocus / Drive' (sub menu 6) and checked (enabled) all the options (both the square box, and bullseyed square box on right), but it still isn't locking focus. Phase Detection is enabled. What am I doing wrong here? It is my understanding that the bulleyed square targets are cross-type sensors (Canon's more advanced, precise focusing technology), and that was my initial intent--to be able to select a focal point, lock it, then recenter and compose the shot. Please help--thanks!
Canon EOS 7D (original--not Mark anything)
Canon EF 85mm f/1.8 telephoto lens
Solved!
Go to Solution.

stockdizzle wrote:
Noob here. I've read the manual and checked Google as much as I can, but I'm unable to solve this simple problem. Just bought a used 7D and can't seem to figure out how to have it stay locked on a target as I recompose the shot. When I half-depress the shutter button it focuses, but when I move the target it changes focus to whatever else was in that focal area. I've tried going into 'C.FnIII: Autofocus / Drive' (sub menu 6) and checked (enabled) all the options (both the square box, and bullseyed square box on right), but it still isn't locking focus. Phase Detection is enabled. What am I doing wrong here? It is my understanding that the bulleyed square targets are cross-type sensors (Canon's more advanced, precise focusing technology), and that was my initial intent--to be able to select a focal point, lock it, then recenter and compose the shot. Please help--thanks!
Sounds as though you have your autofocus mode set to "AI Servo". See p. 88 of the 2012 edition of the 7D instruction manual.
Bob
Boston, Massachusetts USA

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