Nikon late Thursday confirmed the D4. The new full-frame flagship DSLR moves up cautiously to a 16.2-megapixel sensor but is a major leap in image quality over both the D3 and D3s. It doubles the maximum sensitivity to ISO 204,800 and shoots as low as ISO 50 (normally 100 to 102,400). An upgraded 51-point autofocusing system can focus at f8 (up from f5.6) with face recognition an option, and a new color matrix metering system samples from 91,000 pixels.
