Panasonic Lumix S5 Mirrorless Camera - Manual (Page 257)

10. Recording Videos
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0 In the [iA] mode, the camera automatically keeps focusing during recording
standby, irrespective of the [Continuous AF] setting.
0 Depending on the recording conditions or lens used, the AF operation sound
may be recorded during video recording.
If the operation sound bothers you, we recommend recording with
[Continuous AF] set to [OFF].
0 If the zoom is operated while recording videos, the subject may take a while to
come into focus.
0 When the following function is being used, [MODE1] switches to [MODE2]:
– HDMI output
0 [MODE2] does not work during recording standby in the following cases:
– In preview mode
– In low light situations