Thanks Richard for your answer!
Since we mostly make documentaries, we try to make ourselves as invisible as possible during filming. Therefore we avoid using hand claps. I am not sure if it is a good practice. Maybe you can share your experience with us.
The problem we are facing now is, we used to check sync with camera audio during post production. But some people challenge us that the camera audio may not be accurate to use as a guide track, particularly for the distant subjects. Therefore, we are designing some solutions to have a prefect guide track. Do you have any suggestion for this? Yes, the bluetooth transmission isn’t reliable enough.
Thousands thanks,
Anna