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<blockquote data-quote="Bengt Nyman" data-source="post: 333899" data-attributes="member: 13692">Borrowing from what has been written on this subject before, including the Nikon D810 user's manual, this is a Nikon D810 autofocus summary.The Nikon D810 offers a total of ten different AF methods:&nbsp;AF-S, or Single-Point AF allows a choice of 3 alternatives:&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; S, which offers a choice of 51 fixed, selectable, AF points.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; GrP, Group-area AF uses a choice of 51 initial focus points and a small surrounding Dynamic AF-area.&nbsp;&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; AUTO, uses built-in scene recognition and subsequent automatic selection of focus point. Se&nbsp; &nbsp;&nbsp; further AF-C AUTO described below.&nbsp;&nbsp;AF-C, or Dynamic-Area AF with a further choice of 7 alternatives:&nbsp; &nbsp;&nbsp; &nbsp; &nbsp; &nbsp; S, like the AF-S above without having to switch between the two main focusing modes.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 9, uses a choice of 51 initial focus points and a surrounding 9 point Dynamic AF-area.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 21, uses a choice of 51 initial focus points and a surrounding 21 point Dynamic AF-area.&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; D 51, uses a choice of 51 initial focus points and a surrounding 51 point Dynamic AF-area. Choosing an unnecessarily large Dynamic AF-area slows down the autofocus.&nbsp; &nbsp;3D-Tracking, uses a choice of 51 initial focus points as well as color, brightness and lens distance information to maintain focus. As the object moves, or the user re-frames the scene, the system follows the selected object in 3D maintaining focus.&nbsp; &nbsp; GrP, Group-area AF uses a choice of 51 initial focus points and a small surrounding Dynamic AF-area.&nbsp; &nbsp;AUTO, does not require the selection of an initial focus point. Instead it uses built-in scene recognition and subsequent automatic selection of focus point.&nbsp; &nbsp; &nbsp; &nbsp; Further advancement of this method, AUTO autofocus is likely to become a valuable method in locating and focusing on common targets such as eyes, faces and more.&nbsp;In addition to the methods above, the Nikon D810 offers a number of Custom Settings which also control autofocus functions.&nbsp; &nbsp;&nbsp;A1, AF-C controls whether photographs can be taken only when the camera is in focus.&nbsp;A2, AF-S controls whether photographs can be taken only when the camera is in focus.&nbsp;A3, controls how AF adjusts to sudden large changes in the distance to the subject.&nbsp;A4, controls which manual controls that can trigger AF.&nbsp;A5, controls viewfinder AF point display during manual focus, Dynamic-area AF and Group-area AF.&nbsp;A6, controls whether the active focus point is highlighted in red in the viewfinder.&nbsp;A7, controls whether focus point selection “wraps around” the display during selection.&nbsp;A8, controls the number of focus points available for initial focus point selection.&nbsp;A9, controls the translation of selected focus point and AF-area when the camera is rotated.&nbsp; A10, controls the built-in AF-assist illuminator.&nbsp; A11, controls which AF-area modes that can be selected using the sub-command dial.&nbsp;A12, controls which AF modes that can be selected using the main command dial.&nbsp;&nbsp;F5, assigns functionality to the AE-L/AF-L button. For further information see the Nikon D810 user's manual.</blockquote>

[QUOTE="Bengt Nyman, post: 333899, member: 13692"] Borrowing from what has been written on this subject before, including the Nikon D810 user's manual, this is a Nikon D810 autofocus summary. The Nikon D810 offers a total of ten different AF methods: [B]AF-S, or Single-Point AF allows a choice of 3 alternatives:[/B] [B] S,[/B] which offers a choice of 51 fixed, selectable, AF points. [B][B]GrP,[/B][/B] Group-area AF uses a choice of 51 initial focus points and a small surrounding Dynamic AF-area. [B] AUTO,[/B] uses built-in scene recognition and subsequent automatic selection of focus point. Se further [B]AF-C AUTO[/B] described below. [B]AF-C, or Dynamic-Area AF with a further choice of 7 alternatives: S,[/B] like the AF-S above without having to switch between the two main focusing modes. [B]D 9,[/B] uses a choice of 51 initial focus points and a surrounding 9 point Dynamic AF-area. [B]D 21,[/B] uses a choice of 51 initial focus points and a surrounding 21 point Dynamic AF-area. [B]D 51, [/B]uses a choice of 51 initial focus points and a surrounding 51 point Dynamic AF-area. Choosing an unnecessarily large Dynamic AF-area slows down the autofocus. [B]3D-Tracking, [/B]uses a choice of 51 initial focus points as well as color, brightness and lens distance information to maintain focus. As the object moves, or the user re-frames the scene, the system follows the selected object in 3D maintaining focus. [B]GrP,[/B] Group-area AF uses a choice of 51 initial focus points and a small surrounding Dynamic AF-area. [B]AUTO, [/B]does not require the selection of an initial focus point. Instead it uses built-in scene recognition and subsequent automatic selection of focus point. Further advancement of this method, [B]AUTO [/B]autofocus is likely to become a valuable method in locating and focusing on common targets such as eyes, faces and more. In addition to the methods above, the Nikon D810 offers a number of Custom Settings which also control autofocus functions. A1, AF-C controls whether photographs can be taken only when the camera is in focus. A2, AF-S controls whether photographs can be taken only when the camera is in focus. A3, controls how AF adjusts to sudden large changes in the distance to the subject. A4, controls which manual controls that can trigger AF. A5, controls viewfinder AF point display during manual focus, Dynamic-area AF and Group-area AF. A6, controls whether the active focus point is highlighted in red in the viewfinder. A7, controls whether focus point selection “wraps around” the display during selection. A8, controls the number of focus points available for initial focus point selection. A9, controls the translation of selected focus point and AF-area when the camera is rotated. A10, controls the built-in AF-assist illuminator. A11, controls which AF-area modes that can be selected using the sub-command dial. A12, controls which AF modes that can be selected using the main command dial. F5, assigns functionality to the AE-L/AF-L button. For further information see the Nikon D810 user's manual. [/QUOTE]

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