 It is also Nikon's first full-frame camera to feature HD (720p/30) video recording.While it retains the same number of pixels as its predecessor, the imaging sensor has been completely redesigned.Nikon claims improved ultra-high image sensor sensitivity with up to ISO 102400, HD movie capability for extremely low-lit situations, image sensor cleaning, optimized workflow speed, improved autofocus and metering, enhanced built-in RAW processor, quiet shutter-release mode, up to 4,200 frames per battery charge and other changes compared with the D3.