Nikon is once again staking its claim as the professional imaging camera manufacturer of choice with its new 16.2-million-pixel D4S. Based on its previous flagship model, the new D4S isn't an entirely new camera, but rather a finely tuned incarnation of the award-winning D4. As well as developing a new processor for the D4S, Nikon has revisited the CMOS FX-format sensor it created for the D4 and made improvements, along with refining the camera's AF algorithms to make the autofocus snappier. Unfortunately we weren't able to see a comparable improvement in AF acquisition during the brief time we had with the camera, but I have seen the results from real-world testing of the camera tracking fast-moving subjects and, out of 15 frames shot on a single high-speed trigger, all but two appeared to be spot-on.
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