I have watched the video several times.
I can auto focus to get starting point.
Then when I try to use the arrows to move focus, nothing happens.
OK... I put on my only canon lens 24-105 L and it will focus step. The sigma just does not do this.
Canon 5D iv with remote - Sigma 105 DG macro NOOP
Re: Canon 5D iv with remote - Sigma 105 DG macro NOOP
That can be about servo / continuous AF. Must be single shot AF.