The Nikon D750 has been a very successful camera getting rave reviews (including our own) and being commercially picked up by many wedding photographer. But all is not well as several D750 owners are reporting a dark band issue that appears on the top edge of the frame. The problem seems to only appear when there’s lens flare in the image where it produces an ugly separation between the top of the photo and the rest of the frame.
Users began reporting the issue a month ago and now after much discussion Tomasz Piotrowski a Polish Nikon forums user on Nikoniarze, has discovered the culprit. Upon comparing two Nikon D750 cameras, Tomasz discovered the source of the problem comes from the autofocus sensor module positioned directly in front of the D750’s mirror box.
It appears the autofocus sensor should sit flush with the bottom of the mirror box. However, the “bad units” afflicted by the dark band issue have a sensor unit that protrudes slightly by just a few millimeters and apparently this small difference is enough to cause a big issue. More analysis after the jump.