I filmed the contents of the following video with a Nikkor 35 mm prime lens using Nikon D3200. I set the focusing mode to Auto. And the sights in the video were constantly alternating between in-focus and out-of-focus.
I wonder how I could I have brought everything in focus all through video without it going in-focus then out-of-focus then in-focus?
(Manual focusing would not have solved the issue, for in that case I would have to manually adjust the focus every few seconds)
Read more: How to solve this focusing issue on my DSLR?