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Dynamic area AF versus 3D tracking

km6xz

St Petersburg, RU
3559 posts

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"RE: Dynamic area AF versus 3D tracking"

km6xz Moderator Awarded for his in-depth knowledge in various areas, including Portraits and Urban Photography Nikonian since 22nd Jan 2009
Sat 12-Jan-13 07:30 AM

3D tracking works well when the subject color is distinct from the back or foreground so it is aware of the subject itself, even amongst other items of different color in the frame. With a sports team, everyone with a red jersey will be a candidate for capturing the attention of the AF system if the original subject moves out away from the initial focus point. The camera is doing a lot of number crunching so 3D might be a little slower in response, but it does work well if given the right conditions.
AF Dynamic Area is essentially single point with the added benefit of using surrounding focal points to add input if the subject moves out of the range of the selected focal point. The focal point does not change but the surrounding points are used for additional information. This also is calculation intensive so using the fewest number of additional focus points as aids will be faster. Nine point Dynamic is the fastest of the adaptive modes. 39 is the slowest but both are good.
Single point is fast and accurate but limited to data from a single point, which if the center most point will be the most sensitive. It is a cross polarized point that is equally as sensitive to edges that have vertical as well as horizontal components.
Giving the AF system a lot of light really helps all modes so regardless of the aperture you are shooting the frame with, having a fast lens(widest possible aperture)really improves AF performance. AF and metering is done at the widest aperture the lens is capable of, and the camera stops down the aperture to the selected shooting aperture an instant before the shutter opens. A f1/4 lens is the easiest method to improve AF performance even if you are shooting at f/8. A kit lens at its longest focal length might have the widest aperture of f/5.6 so the AF can't be expected to track fast subjects well in anything but very good light. If for AF performance alone is judged, it would be worth renting, borrowing or buying a fast lens for dim light sports.
Stan
St Petersburg Russia

Visit my Nikonians gallery.

A general, generic topic Dynamic area AF versus 3D tracking [View all] , Nikon32250 Silver Member , Fri 11-Jan-13 01:40 PM
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