Nikon's new D4S DSLR improves speed and focusing, adds ISO settings up to 409,600

The Nikon D4S has been teased, displayed in a plastic case and now, it's official -- and we even got to play with it. There's a substantial list of what hasn't changed (the same 16.2-megapixel image size, to begin with), but if you're a high-level...



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