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workerdrone wrote:
D800 shooters, how much time have you spent with the face detection and fast lenses? I'm wondering how well it works with off center subjects and wide open glass such as the 85 1.4, 200 2.0, 24 1.4. Not so concerned with fast moving subjects as, will it reliably hit focus and free you up to watch composition and expression?
If the 85 and 50 F1.8 AFS lenses could be considered "fast", then I might add something... :-)
You question isn't really related to the camera. (!)
If the outer points will work well depends on the amount of curvature of field in the lens, and also the amount of astigmatism. And you have to realize that the error will be hugely more important if you shoot the 24mm at F1.4 than if you shoot the 200mm at F2.0. Angular distance varies a LOT with wide-angles, and almost not at all with telephoto lenses. As icing on the cake, WA lenses often have very much more curved focus-planes also...
Doing "focus&recompose" at a static target with the 200mm lens will not actually hurt the accuracy very much. But put a lens like the 24 or the older 28/2.8AIS on the camera, and you're in for a world of pain.
And WHY shoot static targets at maximum aperture? Isn't extremely short DoF getting kind of old by now?
The face-recognition in itself works very fast, as as far as I can see right now, also very accurately. But the result will vary with the lens you put on the camera. With the 50mm lens I have no problems at F2.8, but I wouldn't want to try it with the 24/1.4 wide open.
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