Nikon Ambassador, sports and commercial photographer, Dave Black shares why he thinks the Nikon D4S's Group Area AF is the camera's best feature.'There is no question that the autofocus exceeded what I thought was possible. To be able to track that precisely and to pick up the subject form a long distance away... and still sharp, it's amazing.' - Dave Black.Nikon D4S's Group Area AF tracks fast-moving subjects over long distances with phenomenal precision. Group Area AF mode constantly monitors five different AF fields, offering improved acquisition and background isolation when shooting subjects that are comparatively small and close to a high-contrast or distracting background. The five-point AF area can be shifted across the 51-point array as composition demands.Find out more about the Nikon D4S http://bit.ly/1hsONix

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