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I do not know the relationship between gimbal and AF that you ask about. But Canon DSLR AF is not that great in an aircraft. I run manual focus to the leg of the infinite mark "L" on lenses ( a very specific point short of infinity that renders 50 foot to infinite coverage. That is what I would recommend. My experiences are with the 7d, in summary minor vibrations that may not affect a photo at 1/500'th will affect AF's performance prior to taking the shot, no AF!