I've been referring to the 5D + 15mm settings for the NN5, but I've come to realize that the 2 cameras are slightly different, does anybody have the exact settings for the 5D2 and the 15mm on a NN5?
The 5D and the 5D Mark II are identical but you can still experience some differences regarding the lower rail because the bottom plate may not be plane.
My 5D MarkII needed a peace of duct tape at the bottom to adjust for this. Before I discovered this I also believed that it was different from my 5D.
Unless your NN5 is very old the bottom rail setting should be 55-56mm and the top rail 81mm.
As for stitching there is a small difference (0.3 degrees) in the optimized FOV because the MarkII has a slightly larger sensor.