The autofocus is incredibly effective in video mode, although it performs notably better in 6.2k and 4k HQ resolution than in the regular 4k mode. The above results are for the 4k HQ mode, but you can see how the autofocus performs in regular 4k mode here for object tracking and here for face tracking. 6.2k object tracking is included here for reference. Generally, though, the autofocus is quite reliable and tracks moving subjects quickly and accurately.
In addition to human face/eye detection, you can choose between different subject detection modes, including Animal, Bird, Automobile, Motorcycle, Airplane, or Train. With continuous autofocus, you can choose between two area modes: ‘Multi’, which automatically detects and tracks a subject in the frame, and ‘Area’, which gives you a smaller moveable focus area. However, unlike competitors like Canon or Sony, there’s no general selectable subject tracking outside the camera’s automatic subject detection modes.
