Quote:If you want to shoot a golfer swinging, you would lock focus around his waist line. For almost the entire swing, his belly button is not going to move.Like all people shots, you kinda want his face most in focus. Or the thing they are busy with which makes the shot important (a ball, a racket, a golf club). Not bellies.
The last thing you would want is for the camera to follow his club because that is moving all over the place.
Unrelated to your post, but about the D500:
I read its 4K is restricted by cropping the central part of the image. Lame, kinda? Again, Samsung's NX1 can do 4K without cropping, using the width of the sensor. And the GH4 also offers a bigger frame. Hmmm.
So both the D5 (FF, but limited to 3 minutes) and the D500 (central part of APS-C frame, 10 minutes recording) are not too serious a tools for 4K.