In diesem Interview wird u.a. auf die Arbeitsweise der beiden AF-Module eingegangen:
http://www.imaging-resource.com/news/2012/...ats-the-deal-wi
ZITATWell, with the focal plane phase detect 102-point array and the 19-point conventional sensor, what we're able to do is enable two features. One is AFD which is Autofocus with a Depth map, and also AF range.
AFD, which is the primary function, allows the additional points to provide a depth map of information from which the camera can operate. Not only is the coverage area expanded but the density of the points is expanded as well. As a result, subjects that are moving rapidly or subjects that are moving erratically not only have a wider area of coverage, but there is also a greater likelihood that as they move through the frame, they're always going to have at least one if not several AF points that they'll be passing through to allow the camera to have not only much more accurate, but much more consistent focus data to work from. So this is particularly important in the context of very small subjects that might be moving across a complex background that might cause lesser AF systems to become distracted off of the target and on to the background.
It's also the case if there are subjects moving in the foreground that might distract the AF system as well. So particularly for subjects that are moving rapidly or erratically, particularly useful in sports, and also for users that are shooting for instance birds in flight with high-magnification telephoto lenses. This is also important as well. Not only is it that the area is expanded, but also the density of the AF points is expanded as well, so that it's much more likely that the subject is going to be covered by an AF point as it moves through the frame. So that's AFD. That's a very important development and we think it's really going to aid consumers who are shooting difficult-to-track targets.
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A conventional AF sensor as we know it in SLRs so far really concentrates on camera to subject distance, whereas the focal plane phase-detect sensors really are concentrating more on how the subject is moving across the image plane. ...
DE: ... But rather than thinking of the image plane phase-detect sensors is being autofocus points, it's more like thinking of that becoming a depth sensor. So the camera actually has a depth map of the frame that it can use to figure out where the subject is and how it's moving.
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DE: Is there any difference in accuracy between the in-plane phase detect and the separate phase-detect system?
MW: Not really. Again, it's been suggested by some that since the focal plane phase detect is at the image sensor plane itself, it should have an effect on back focus or front focus, but not that we've been able to see.[/quote]
Zwischendurch wird auch auf die AF-Range Funktion eingegangen. Mehr möchte ich nicht zitieren, es bleibt auch danach noch interessant, lest das gesamte Interview bei Imaging-Resource!