Canon has issued a service notice for its two flagship pro cameras, the 1D Mark III and the 1Ds Mark III.  The service notice relates to excess oil used to lube moving parts inside the mirror box.  Unfortunately, if too much oil is applied during the manufacturing of the cameras, it can lead to spots on the sensor.  Canon is offering to clean the mirror box of affected cameras free of charge.

We offer our most sincere apologies to customers using these products who have been inconvenienced by this issue. Going forward, we will spare no effort in our quality management to make sure our customers can use our products with confidence. We hope our efforts will earn your understanding.

More details are available on Canon’s service notice page.