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On the inside, the DSLR is a much larger upgrade. There's a 16.2-megapixel FX format CMOS sensor inside, measuring 36.0 x 23.9mm. It has a native ISO of up to 12,800, higher than was originally rumored, and is expandable to 204,800. The camera is faster than ever, too, thanks to Nikon's new Expeed 3 processor — reps said the D4 will boot in .012 seconds, has .042-second shutter lag, and will shoot at 11 frames per second, one faster than the D3s. The Expeed 3 processor also improves autofocus performance, which still has 51 points but can use phase detection in even worse lighting conditions. (The autofocus system upgrade also now supports any Nikon lens up to f/8, which is pretty much all of them.) The RGB metering sensor has been bumped up to 91,005 pixels, which makes metering far better, particularly on small subjects. Live View and Movie mode autofocus have both been improved as well — which any D3s user knows is not a moment too soon — though it's still contrast-detect autofocus.
Video performance in general was clearly high on Nikon's list for the D4's functionality. The new shooter captures 1080p30, 1080p24, and 720p60 video, and Nikon has added smooth aperture adjustment as well as three different crops for video, up to 2.7x — that means you can shoot 1080p video, and give it the appearance of being zoomed a long way without any special optics. There's a new 20-level audio metering system, plus a headphone jack with 30-level adjustment so you can monitor straight from the camera. Apparently Nikon had some processing power to spare, too, because you can stream a full, uncompressed 720p signal out of the camera through its HDMI port, and view it on the camera simultaneously.
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