Nikon has issued a product advisory in which the company acknowledges that a number of Nikon D600 cameras may have been shipped to customers with dirt on their low-pass filters. Reminding users that “the structure and concept of digital SLR cameras makes the complete elimination of… dust spots very difficult,” Nikon suggests that they clean the camera’s sensor - or, more precisely, the surface of the low-pass filter - using a blower. If this does not help, they should “consult [their] nearest Nikon service centre.” The product advisory does not say explicitly that the affected cameras will be cleaned free of charge, only that they will be “thoroughly” examined and serviced “as needed.”