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Message: <blockquote data-quote="Gewitty" data-source="post: 633814" data-attributes="member: 41952">I use back button focusing on my D7200 because it takes so much hassle out of composing a shot and also allows me to seamlessly shift from single point static focusing to continuous tracking of a moving subject. In a static scene, I pick the point I want to focus on, centre this in the viewfinder (which shows the single central focus point) press the back button to achieve focus lock, then recompose. If the subject is moving, I centre it in the viewfinder (which still shows a single central focus point), but this time hold the back button down as I track the subject.Both these techniques work very well. However, what I'm not clear about is what setting I should use for the number of active focus points. The D7200 has a maximum of 51 points, so I normally have all of these active, on the assumption that this will allow the camera to keep focus, even if the subject moves significantly away from the centre of the viewfinder.So the question is this: Am I right in making that assumption, or are there times when I should select a smaller group of focus points and if so, why? A secondary issue is why do I only ever see the single central focus point in the viewfinder, even when holding the back button down, which means I'm in AFC mode?I hope I've explained that clearly enough, but let me know if more info is needed.</blockquote>