Hello, I'm wanting to ensure that my D4 is set-up property to provide Dynamic AF capability. I would have thought that..after setting the various features (Dyn AF, 21pt, Continuous focus, etc), that I could just focus on a subject, move my camera slightly off to one side and watch the focus points remain locked on the subject. Should I not see the 21pts move around, tracking the original 'subject' as the camera is moved around...assuming I continue to hold the AF-ON button.
The display in the viewfinder only shows the starting point and does not track the dynamically selected focus point. As far as I know, that is normal for all Nikon DSLRs.
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That would be a terrible way for the camera to work. In shooting a moving subject, I want to try to keep the subject framed just so. In other words, I want a particular spot in the frame to be the focus point. I choose a dynamic-area mode when the subjects move too quickly for me to be able to ensure I can keep the focus point on the subject, but if the camera moved the indicated focus point, it would be a lot harder for me to keep track of where in the frame my original selected point was. I'd end up following the moving "dot" and my subject would inevitably drift to the edge of the frame!
When the camera is in the Auto-area mode it will work as you described.
Yes the dynamic 21 point af is setup to track fast moving objects and is a poor way to shoot static subjects. On static subjects move your focus point by unlocking the af point lock, then moving af point to subject. The other way is to use single point af focusing on the subject, then release back button focus, recompose, then click.