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AF POINT OPTIONS for shooting moving subjects

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AF POINT OPTIONS for shooting moving subjects

Postby chicagotech » Wed Mar 01, 2017 4:53 pm

Single-point/Spot AF, AF Point Expansion/Surround and Zone AF are most valuable when shooting moving subjects in AI Servo Mode, particularly situations where the subject is moving so quickly that automatic focus and focus point selection is the only reliable way to get a high ratio of correctly focused images. If you primarily photograph motionless subjects or are shooting video (which uses a different AF system) you may never need to adjust any of the following settings.

Single-point/Spot AF
With this option you choose one of the 61 available AF points for subject tracking. Spot AF narrows the size of the AF point to focus on small areas of a subject or scene. Keep in mind, however, that it may be difficult to track a subject that is moving rapidly.

AF Point Expansion/Surround
With this option the camera must first achieve focus with the primary AF point located in the center of a 4-point (expansion) or 8-point (surround) cluster. The camera will then use the outer points as necessary to maintain focus on a moving subject. For many shooters this is the ideal compromise between the narrow angle of Single-point/Spot AF and the wide coverage of Zone AF.

Zone AF
This option expands the number of active AF points to 9 or 12 points in a 3x3 or 3x4 grid. All AF points within the Zone are active. Having a larger AF zone makes it easier to keep a moving subject within the AF system’s field of view. One possible drawback is that because Zone AF always focuses on the nearest object, maintaining focus on a single subject may be more difficult than with a smaller AF area, especially if the subject is small in proportion to the frame and there are other, larger objects in front of it.
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