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Nikon Issues D750 Service Advisory
20 January 2015
Nikon has issued a D750 service advisory for owners of the D750 dSLR affected by the flare shadow issue. The advisory provides a serial number check and instructions for servicing the affected cameras at a Nikon service center.
At a minimum, the advisory provides a link to check the serial number on any D750 to confirm if it is in the batch of cameras affected by the problem:
To check whether or not your camera is one of those affected by this issue, click Check Your Serial Number below and enter your D750's serial number as instructed. Results for the serial number entered will be displayed. If these results show that your camera is one of those affected, instructions for requesting service will be displayed. If your camera is not one of those affected, rest assured that you may continue using your camera without concern for this issue.
The advisory further notes that repaired cameras will have "a black dot inside the tripod socket on the bottom of the camera." If you're looking for a used D750, you'll have to check the serial range on the advisory page and, if it's an affected camera, confirm has a black dot in the tripod socket.
Nikon further advises:
Please understand that even with these measures, all digital SLR cameras may experience flare when backlit scenes are being captured.
Flare itself, however, isn't the issue. It's what Nikon refers to earlier in the advisory as "flare with an unnatural shape ." The shape isn't unnatural so much as a shadow along the top border of the frame.