By contrast, the more conventionally used contrast AF method looks for the focal position while moving the lens back and forth, so AF speed ends up being slower and not as smooth.
With face and object tracking engaged, Movie Servo AF follows a chosen subject as it moves, or when you recompose a shot. Alternatively, just select different focus areas by simply by tapping the touch-screen when recording.
At launch, Dual Pixel CMOS AF is compatible with 103 EF lenses, spanning EF and EF-S, fixed focal length, wide-angle and telephoto lenses. The system marks a significant advancement in autofocus performance with greatly improved AF speeds.
Please view the Dual Pixel CMOS AF – EF Lens compatibility list