>Point taken on accuracy. I was looking for accuracy of +/- 1 >foot at 30 feet or so.
This isn’t authoritative but base upon my experience but I think the distance is fairly accurate at close focus distances and depending on the lens gets less accurate with increased distances.
As to depending on the lens, for example my Nikkor 17-55 f/2.8 from near focus to about 5 feet uses about 2/3 the amount of travel of the focus ring. The next distance reported after 5 feet is 10 feet then to infinity in the last 1/3 travel. I have not checked it thoroughly, but I imagine the reported distance will be fairly accurate in this case up to about 5 feet, than the accuracy getting exponentially worse after 10 feet (small amounts of movement create greater amounts of focus distance change).