What every written here are very technical. I have a very basic issue and I am going no where where Nikon support. I have lots of noise big dots on everywhere on the image even at ISO800 or lower. The Nikon Service person said he does not see any issue. I hope other D800 owner's may help me whether it is normal or not. I cannot upload the image. Anybody is willing to help me, I will glad to send the image over.