When paired with the Hybrid CMOS AF, it allows for smooth and quiet, continuous AFfor photo and video capturing - making it the perfect combination for preserving those once in a lifetime moments.
With Canon's Hybrid CMOS AF System and Movie Servo AF, the camera provides continuous AFfor focus tracking of moving subjects by helping to reduce the camera's need to "hunt", resulting in a quick and smooth continuous AF.
While Nikon pioneered HD video in a D-SLR, Nikon is now introducing another industry first to enrich the user experience: The D3100 is the first D-SLR to implement full time AFfor D-Movie video shooting and while in Live View mode.