The camera has been plagued by a shutter problem since day one, with spots appearing on images, primarily in the image’s top left corner, but not confined to there. It has been suggested the spots are caused by lubricant from the shutter mechanism.
Nikon says it will fix the problem, even if the camera is out of warranty:
“. . . we will continue to offer users of the D600 a special service with which cameras are inspected, cleaned, and if necessary, shutter and related components are replaced free of charge, even after the product warranty has expired.”
Even better, for those still experiencing the problem, Nikon says “if a number of multiple granular black spots are still noticeable in images captured with a D600 upon which the above service has been performed several times, Nikon will replace it with a new D600 or an equivalent model.”
An expensive proposition for Nikon, but a necessary one, in the author’s opinion.
D600 owners in Canada should contact Nikon Canada.