Nikon’s Australian website has posted a service advisory for the D810 concerning ‘bright spots’ that may appear in long exposures and provided a link to free servicing of affected cameras.
The text on the local website reads: We have received reports from some users of the Nikon D810 digital SLR camera indicating that bright spots are sometimes noticeable in long exposures, and in some images captured at an Image area setting of 1.2x (30×20). After looking into the matter, we have determined that bright spots may on occasion be noticeable when shooting at long exposures, and in images captured at an Image area setting of 1.2x (30×20).
Nikon service centers will service these cameras as needed free of charge. Kindly follow the instructions below to identify and service your camera if it is affected.
Readers with camera they think may be affected by this problem should visit http://www.nikon.com.au/en_AU/service-and-support/nikon-service-advisory.tag/en_Asia/service_advisory_notices/d810_service_advisory.dcr where they will find full details on how to identify affected products and the serial numbers of cameras likely to be affected. Assistance is also provided on consulting a Nikon service centre to have the problems rectified.