New - Nikon - D4S improvement over D4 re mirror balancer - actual sports demo

[Nick Walker]

http://www.youtube.com/watch?v=VjW8dDb_mVA&list=PLW1QAZk93Tp90Rj9JsTaBpo809q57N5nm&spfreload=10

From 0.25 sec video of D4 and D4S mirror actions compared through the viewfinder on the same gymnast - a noticeable difference in mirror slap and stability of image during capture, this helps maintain more accurate framing during high speed sequences and improves AF accuracy/stability.

From 1 min 45 sec, VR sport mode, versus standard VR mode, compared on skier.