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General Photography
Why I use single point focus
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<blockquote data-quote="Horoscope Fish" data-source="post: 689640" data-attributes="member: 13090"><p>I use Group AF a lot too and it took me a while to figure out how it works exactly. </p><p></p><p>What I like about Group AF: It uses all five-focus-points simultaneously to achieve focus lock (sweet!), it automatically employs a degree of focus-tracking (sweet!) and, when in AF-S mode, Group AF also employs facial-recognition and attempts to focus on the eye of the nearest person (sweet!). In my experience no other focus-mode snaps to and maintains a solid focus-lock like Group AF. In low light situations where other modes struggle, or fail entirely, Group AF will grab and cement a focus-lock without hesitation. </p><p></p><p>To better explain how it does what it does, think of the whole <em>group</em> of five focus-points you see in the viewfinder as <em>one</em>, humongous focus-point. I say that because Group AF will always attempt to focus on the <em>nearest</em> bit within the group of focus-points without giving preference to any <em>particular</em> focus-point (because it's acting like a really big single point). That's a subtle, but important, difference.</p><p></p><p>With Group AF the criteria for <em>where</em> to lock focus is, "What's closest?" Closest Bit = Bit Most in Focus.</p></blockquote><p></p>
[QUOTE="Horoscope Fish, post: 689640, member: 13090"] I use Group AF a lot too and it took me a while to figure out how it works exactly. What I like about Group AF: It uses all five-focus-points simultaneously to achieve focus lock (sweet!), it automatically employs a degree of focus-tracking (sweet!) and, when in AF-S mode, Group AF also employs facial-recognition and attempts to focus on the eye of the nearest person (sweet!). In my experience no other focus-mode snaps to and maintains a solid focus-lock like Group AF. In low light situations where other modes struggle, or fail entirely, Group AF will grab and cement a focus-lock without hesitation. To better explain how it does what it does, think of the whole [I]group[/I] of five focus-points you see in the viewfinder as [I]one[/I], humongous focus-point. I say that because Group AF will always attempt to focus on the [I]nearest[/I] bit within the group of focus-points without giving preference to any [I]particular[/I] focus-point (because it's acting like a really big single point). That's a subtle, but important, difference. With Group AF the criteria for [I]where[/I] to lock focus is, "What's closest?" Closest Bit = Bit Most in Focus. [/QUOTE]
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Why I use single point focus
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