Canon have issued a service notice for the Canon EOS 1D Mark III and 1Ds Mark III DSLRs. The service notice concerns the problem of ring-shaped spots appearing in photos taken with some of these cameras. The company claims that these spots are “images of oil lubricant on the surface of the low pass filter”. The oil is allegedly used to lubricate some of the camera’s moving parts, but can become scattered onto the surface of the low pass filter through normal camera operation if it is “applied too liberally when the camera is manufactured”. Customers who are encountering this phenomenon or, who have noticed that oil is visible on the surface of the back side of the mirror, are asked to contact a Canon service centre for a free cleaning of the mirror box.

Website: Canon Products Support

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