The Canon 1D Mark IV is a top-of-the-line camera for the most serious of all serious photographers. It a features a 16.1 megapixel CMOS sensor and dual DIGIC 4 imaging processors, 1080p HD, 45-point area auto focus, and a 3.0-inch Clear View II LCD monitor. This is sure to appeal to all range of professionals, from sports to photojournalists to nature and fashion photographers. Reviews seem to indicate that its direct competitor, the Nikon D3s, outperforms the Mk. IV in low lighting, but overall they're fairly evenly matched.