<p>Nikon first showed off its newest full-frame D-SLR, the D4S, at CES. The company planned to put in the hands of photographers covering the Winter Olympics in Sochi, and sought to quell speculation by announcing that yes, the camera was coming. But it provided no other details at that time, opting instead to wait until today to reveal its tech specs to the world.</p><p>The D4S is the replacement for the D4. Like its predecessor it's a fast-shooting, big camera that's aimed squarely at photojournalists and sports photographers who demand incredibly fast, accurate focus at high frame rates. The D4S uses a new image sensor, but one with the same 16-megapixel resolution of the D4, and a new EXPEED 4 processor that supports continuous shooting at 11fps with autofocus and autoexposure for each shot. An improved mirror return system lessens the blackout time between shots.</p><p>The sensor design does include an optical low-pass filter, which has been removed from recent cameras from Nikon, including the current top-end APS-C model, the D7100. Omitting the OLPF increases the absolute sharpness of images, but a Nikon spokesperson stated that low pixel density of the D4S sensor is more prone to color moire than the 36-megapixel D800E, so it remains a necessity.</p><p>The low pixel density does give the D4S a distinct advantage compared to other full-frame cameras: Low image noise. We haven't had the opportunity to test it, but the D4 was the best low-light camera to pass through our testing labs in memory, and the D4S promises to better it. The new camera can shoot at ISO 25600 in native mode, and it can be pushed all the way to ISO 409600 in extended mode.</p><p><a href="http://www.pcmag.com/article2/0,2817,2453802,00.asp">Keep reading...</a></p>