2. Super-sensitive, full-frame sensor.
Despite Nikon's years of insisting it was firmly committed to its APS-sized DX sensors, out it comes with the D3's 12.1MP full-frame (23.9x36mm) sensor. Certainly, it can't do battle on the resolution front against Canon's new EOS 1Ds Mark III ($8,000, body only, street), with its 21.1MP full-frame sensor. But Nikon wasn't aiming at that target. Instead, it opted for a sensor with larger pixels and thus greater light sensitivity to appeal to pros who want to shoot without flash, increase the range of their flash units, or use a smaller aperture to extend depth of field.