I keep the PDF for the N55, N75, F100 and F6 all on my phone in iBooks. I'm constantly referring to them in terms of flash compatibility, metering modes, AF modes, special functions, etc, etc. I can't imagine anyone memorizing all that.
For example I put the 28/1.8G on the N55 and the AF did not work. I had to look it up, this is normal. Only AF confirmation dot works with that lens on that camera.
Then I put the 28/1.8G on the N75 and neither the AF or the confirmation dot worked. Is the N75 bad? Had to look it up. Because the "Roll end" light was flashing in the viewfinder, the AF won't work. I realized there was a spent roll of film in the camera. After removing that all was well. That lens does indeed work with all functions on the N75.