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Message: <blockquote data-quote="Keith Reeder" data-source="post: 1523994" data-attributes="member: 4913">It's not a "common" (single) fault at all - the number of Err 99 posts is clearly distorted by the fact that people only post when something's wrong; and Err 99 is a catch-all for any number of problems that aren't, in themselves, common enough to warrant a "bespoke" error message number. "Known" faults and "common" faults are by no means the same thing - it's like saying the Ebola virus is common because you've heard of it...  All Canon DSLR bodies can get an Err 99, and the number of 40Ds with ongoing Err 99 problems is a vanishingly small percentage of the number sold (something in excess of 100,000) - hell, I've had a 40D since September 2007 and I haven't had a single Err 99 (or with either of my 30D bodies which I've had since early 2006). Some facts: <a href="http://www.lensrentals.com/news/2008.12.31/canon-err99" target="_blank">http://www.lensrentals.com/news/2008.12.31/canon-err99</a></blockquote>