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<blockquote data-quote="WayneF" data-source="post: 550293" data-attributes="member: 12496">I don't have a D3100, so am unsure of it, however, I really doubt Singe Point can ever follow subject motion in any case or model.&nbsp; The idea is user selects the single point, not the camera as in other cases.&nbsp; It focuses on whatever is under the place where we position that one point.The D3100 manual says of Single Point :&nbsp; &quot;Camera focuses on subject in selected focus point only. Use with stationary subjects.&quot;&nbsp; And then AF-S focus is locked at half press, it does not follow anything then. I am unsure what AF-C does in that case?&nbsp; Keeps focusing on that one spot, but it is single point.Also says there: &quot;User selects focus point using multi-selector.&quot; So iIt can use any of the multiple focus points (different positions not in center), but only the one selected.&nbsp; Then holding AF-S half press locks focus there, and then we can move the camera a little to reframe the subject (while holding half press).&nbsp; IMO, this is big stuff.&nbsp; <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile&nbsp; &nbsp; :)" loading="lazy" data-shortname=":)" />If intending to follow motion, then you have to use a lot of points, to give it other places to look for the motion to move to.</blockquote>

[QUOTE="WayneF, post: 550293, member: 12496"] I don't have a D3100, so am unsure of it, however, I really doubt Singe Point can ever follow subject motion in any case or model. The idea is user selects the single point, not the camera as in other cases. It focuses on whatever is under the place where we position that one point. The D3100 manual says of Single Point : "Camera focuses on subject in selected focus point [B]onl[/B]y. Use with [B]stationary[/B] subjects." And then AF-S focus is locked at half press, it does not follow anything then. I am unsure what AF-C does in that case? Keeps focusing on that one spot, but it is single point. Also says there: "User selects focus point using multi-selector." So iIt can use any of the multiple focus points (different positions not in center), but only the one selected. Then holding AF-S half press locks focus there, and then we can move the camera a little to reframe the subject (while holding half press). IMO, this is big stuff. :) If intending to follow motion, then you have to use a lot of points, to give it other places to look for the motion to move to. [/QUOTE]

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