Today DC.Watch published a long interview with the team that developed the D750 DSLR camera. Most of the Google translation is hard to follow, but I came across an interesting Q&A: the 51 points AF system inside the D750 is indeed narrower when compared to the D810. The reason for that is the reduced height of the D750 body and size of the pentaprism – Nikon had to compromise in order to keep the D750 body smaller.
Update #1 – Nikon selected the 1/4000 shutter speed (and not 1/8000) for the same reason: make the body smaller.
Update #2 – here is a visual comparison of the D750 and D810 focusing systems (both pictures taken from the viewfinder):
If you came across some other interesting information from the interview, please share it in the comments section bellow.
Update – here is another AF area comparison between the D610, D750 and D810 cameras:
