you must disable the af from the shutter button or your refocusing as you pull the trigger which is not what your looking for. I tried one shot once.. then I switched back to servo. once I start shooting I never lift off of the AF on button and only work the shutter watching where my focus is on the animal and shoot when is where I want it.
I know some dont like the deer down but thats the wild life.
forum: Canon EF and EF-S Lenses
Absolutely that's wildlife. For a dead animal shot it's very clean, hardly any red, no guts hanging out...