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D7100 dynamic AF question

Toby01

El Sobrante, US
278 posts

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Toby01 Silver Member Nikonian since 19th Nov 2012
Thu 28-Mar-13 05:47 PM

Until recently, I seldom photographed moving subjects, but I am doing a lot more of that now and have some questions about how dynamic focusing works (this isn't specific to the D7100, but that's the camera I'm using now, so this seemed the right place to ask the question). I think I have a handle on the 3D tracking mode, but in the AF-9 or AF-21 point selections, I think the camera first focuses on the point I have selected and then uses the surrounding points to assist as necessary. My question involves what happens when the subject moves away from that area of the focus screen, either thru their motion or from my reframing of the shot. In these modes, does the camera continue to focus on whatever falls under the original focus area, or does it try to follow my original target? What method do you use when you are trying to follow a target moving across the frame? Thanks for your insights.

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