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EOS-1Ds Mark III

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EOS-1Ds Mark III

EOS-1Ds Mark III

FAQ ID: L00000044
Release date: 14-May-09

FAQ: Why do my images show large ring-shaped spots?


We have discovered that images taken by some EOS-1D Mark III and EOS-1Ds Mark III digital SLR cameras may exhibit ring-shaped spots (see examples below). We would like to convey the details and our service policy.

Large_image Oil_spot_enlarged
Magnified image of the yellow
area in the left image.

Helpful Information:

These ring-shaped spots are the images of oil lubricant on the surface of the low pass filter (LPF), which is located in front of the CMOS sensor.

This oil is used inside the Mirror Box to lubricate some of the camera's moving parts. If the oil is applied too liberally when the camera is manufactured, it can become scattered onto the surface of the LPF through normal camera operation.

* Image of Back Side of Main Mirror


The image above shows the top of the mirror box when the main mirror is flipped up. The white spots  in the red rectangles are excess lubricant oil.


We ask that customers who are encountering this phenomenon or, who have noticed that oil is visible on the surface of the back side of the mirror, please contact our service centers. To prevent oil from scattering, which may seriously affect images, we will offer free cleaning of the mirror box to affected customer to remove the excess oil.

Measures are being implemented to control the amount of lubricant applied during manufacture in order to reduce the occurrence of oil spots. However, because this lubricant is required to ensure proper operation of the camera’s precision mechanical parts, it is impossible to eliminate all instances of oil scattering. If you require CMOS sensor cleaning, please contact our service centers.

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.

For other inquiries about this issue, please contact our helpdesk.

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