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Message: <blockquote data-quote="hark" data-source="post: 751702" data-attributes="member: 13196">I just found this Nikon article which hopefully will provide you with a little more info than what's available in the camera's User Manual. Choosing a lower number of points (such as 11) will make the focus point jump from one point to another thereby skipping some of the in between points. <a href="https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/51-point-autofocus-system.html" target="_blank">https://www.nikonusa.com/en/learn-and-explore/a/products-and-innovation/51-point-autofocus-system.html</a>Here is a quote from the Nikon article which contains helpful information:"The 51-point AF system positions 51 points of focus within the frame to allow photographers to choose a variety of focus configurations to suit the shooting situation.Available in selected Nikon D-SLRs, the 51-point AF system positions 51 points of focus within the frame to allow photographers to choose a variety of focus configurations to suit the shooting situation.The 51-area grid forms a wide rectangle across the frame, with minimal spacing between each AF area. The system keeps even quick-moving subjects in focus across a wide extent of the frame. The 15 points of the three center rows of focus points employ cross-type sensors for powerful focus detection.Nikon’s latest Flagship D-SLR, the Nikon D4s uses Nikon’s Advanced Multi-CAM 3500FX AF sensor module to provide photographers with even more refined focus point capabilities.You can choose to use a single AF point to hone in on an exact spot on your subject in which to focus on, or use all 51 AF points working together to capture moving subjects. Using the Dynamic-area AF and you’ve also got the choice between 11, 9 or 21 AF points.Using an AF NiKKOR lens with an f/5.6 or faster aperture, you can use all 51 AF points for fast and accurate AF detection up to an impressive -2 EV (ISO 100, 20 degrees C), which is approximately the physical limit of the eye to see through an optical viewfinder. What this will provide you with is the ability to shoot more smoothly in low light situations.Most Nikon D-SLRs that utilize the 51-point AF system have the 15 points of the three center rows employ cross-type sensors for added focus detection; detecting contrast in both vertical and horizontal lines. Each cross-type sensor performs at full capacity with any AF NIKKOR lens, f/5.6 or faster."</blockquote>

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