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Nikon DSLR Cameras
D3100
AF Area Mode
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<blockquote data-quote="WayneF" data-source="post: 287959" data-attributes="member: 12496"><p>You may be missing out on a very good thing then. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> That is not how the system is designed.</p><p></p><p> I do use single point non-dynamic focus maybe 99% of time, preferring to chose what I am focused on (stationary subjects, landscapes, portraits, macro, etc). I don't do sports, but there are times the action is just too fast for me, and then the many-points dynamic really comes through, letting the camera have it to run with it, to try to find something to focus on. This action below was quite fast, more so since it was so close (first one is just cropped, it is same distance as the second - but the birds were just a flash).</p><p></p><p><img src="http://www.scantips.com/g2/800_5083b.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="http://www.scantips.com/g2/800_5136.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /> </p><p></p><p>Note there different methods that cameras use to auto focus. The two used in DSLR are Phase and Contrast. The DSLR is predominately Phase Shift, using the viewfinder. But Contrast focusing is done by the mirrorless systems (including compacts and DSLR Live View), when all there is to work with is the image pixels (no actual focus system present). But when the DSLR viewfinder system is instead enabled, its complex dedicated phase shift system just for focus has substantial advantage - (esp speed - but it is a bit complex, see <a href="http://en.wikipedia.org/wiki/Autofocus" target="_blank">Wikipedia</a> ). </p><p></p><p>The above is dynamic Phase using the viewfinder - I very seriously doubt Live View Contrast could hack this.</p><p></p><p>These are extremely different systems. D3100 spec page says: </p><p>Auto Focus is Phase on up to 11 focus points,</p><p>and says Live View is Contrast, anywhere in the frame (there are just pixels to look at, no focus points).</p><p></p><p>The Nikon manuals say use Single Point for stationary subjects. Seems easy to understand. Then dynamic has a few stages of more and more points to try to sense how the motion is moving. Slower motion only needs a fewer smaller group, faster action needs more and wider points to hunt in (and it has a wide choice to choose from). I think the manual says it very clearly.</p></blockquote><p></p>
[QUOTE="WayneF, post: 287959, member: 12496"] You may be missing out on a very good thing then. :) That is not how the system is designed. I do use single point non-dynamic focus maybe 99% of time, preferring to chose what I am focused on (stationary subjects, landscapes, portraits, macro, etc). I don't do sports, but there are times the action is just too fast for me, and then the many-points dynamic really comes through, letting the camera have it to run with it, to try to find something to focus on. This action below was quite fast, more so since it was so close (first one is just cropped, it is same distance as the second - but the birds were just a flash). [IMG]http://www.scantips.com/g2/800_5083b.jpg[/IMG] [IMG]http://www.scantips.com/g2/800_5136.jpg[/IMG] Note there different methods that cameras use to auto focus. The two used in DSLR are Phase and Contrast. The DSLR is predominately Phase Shift, using the viewfinder. But Contrast focusing is done by the mirrorless systems (including compacts and DSLR Live View), when all there is to work with is the image pixels (no actual focus system present). But when the DSLR viewfinder system is instead enabled, its complex dedicated phase shift system just for focus has substantial advantage - (esp speed - but it is a bit complex, see [URL="http://en.wikipedia.org/wiki/Autofocus"]Wikipedia[/URL] ). The above is dynamic Phase using the viewfinder - I very seriously doubt Live View Contrast could hack this. These are extremely different systems. D3100 spec page says: Auto Focus is Phase on up to 11 focus points, and says Live View is Contrast, anywhere in the frame (there are just pixels to look at, no focus points). The Nikon manuals say use Single Point for stationary subjects. Seems easy to understand. Then dynamic has a few stages of more and more points to try to sense how the motion is moving. Slower motion only needs a fewer smaller group, faster action needs more and wider points to hunt in (and it has a wide choice to choose from). I think the manual says it very clearly. [/QUOTE]
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