Question about Canon EOS 40D Digital Camera
Error 99 can be caused by poor communication between the camera and the lens. Often it can be resolved by doing one of these following fixes:
1) Turn the camera off, remove the lens, replace the lens, turn the camera on.
2) If that doesn't work, turn the camera off and remove the lens. Use a clean pencil eraser to clean the electrical contacts between the lens and the camera body. Hold the lens or camera body "upside down" so that the contacts are facing down as you rub them with the eraser so that any eraser debris falls onto the table rather than falling into your camera or lens. Replace the lens.
If neither of these fix your problem you will need to send the camera and lens in to Canon for repair.
Posted on Dec 25, 2008
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