Question: what is the difference between a nikon d4 and d4s?
Answer: The D4S has 30% more computer power than the D4 to allow more noise reduction faster to add a foolish setting of ISO 409,600 (up from 204,800 in the D4), and enough other small tweaks to give 11 frames per second with full autofocus and metering for each frame, up from 10 fps in the D4.