Four major improvements:
1. Maximum movie recording time, including for 4K UHD movies, extended to 29 min. 59 s
Movies up to 29 minutes 59 seconds in length can now be recorded at all Movie quality and Frame size/frame rate settings. The new firmware increases the maximum recording time of even 4K UHD (3840×2160) movies from 3 minutes to 29 minutes 59 seconds. In addition, movies are recorded to up to eight separate files, each of which has a file size of up to 4 GB. Separate movie files can be combined to create a single movie using ViewNX-Movie Editor.
2. Flicker reduction for still images added for more stable exposure under lighting that flickers
When shooting under fluorescent and some other types of artificial lighting, flickering may cause uneven exposure in parts of images and/or variations in exposure and color reproduction characteristics between individual images captured continuously or in quick succession. We have equipped the new firmware with a Flicker reduction function for still images that reduces these effects. When Flicker reduction is enabled, the camera detects peak brightness as light flickers and automatically times shutter release with these peaks in brightness for stable exposure and color reproduction characteristics. This function is effective when continuous shooting is used for indoor sporting events or similar situations captured at fast shutter speeds.
3. 9-point dynamic-area AF AF-area mode added for focusing on a limited portion of a moving subject
With dynamic-area AF, the camera focuses based on information from surrounding focus points if the subject briefly leaves the focus point selected by the photographer. The D5 originally supported 25-point, 72-point and 153-point dynamic-area AF. A 9-point dynamic-area AF option has been added with the new firmware. This new option is effective for focusing on a more specific portion of a moving subject.
4. Electronic vibration reduction function, effective with hand-held recording, added (for HD and full-HD*1 movie recording)
The new firmware has been equipped with an Electronic VR function that reduces the effects of camera shake with hand-held recording of movies in the FX- or DX-based movie formats (image areas). The effects of camera shake in three directions — vertical (up and down), horizontal (left and right), and rotational (around the center of the lens) — are reduced. This function is effective when recording movies in places or situations in which use of a tripod is prohibited or inconvenient, or when there simply isn’t time to set one up. In addition, electronic VR can be used in combination with the optical vibration reduction (VR) built into a NIKKOR lens for more effective reduction of the effects of camera shake.
Thanks NikonRumors for spotting this!