I'm using Nikon D5600 and I don't understand what's the difference between Single-point AF vs. Dynamic-area AF. On my camera you can choose Dynamic-area with 9 points, 21 points or 39 points. However they all look and work the same as when you select Single-point AF. I was testing it on many different subjects but they all seem to be the same as single-point AF. What's your experience? Do you see any difference if you use dynamic-area focus?