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Message: <blockquote data-quote="obrot" data-source="post: 1527140" data-attributes="member: 65006">Keith,having read and re-read that article many times there are preciuous little in the way of facts presented. There is lots of speculation about why ERR99 occur and in fact a whole paragraph entitled "Let's Speculate".I still believe that ERR 99 is a common and known fault albeit a catchall error code as was said before. I can't believe that it is a fault designed to discourage the use of third party lenses and or third party batteries, and believe that if Canon wanted to go down this route then they would incorporate software into both the camera bodies and batteries in the way that Sony have done this for many years. I have encountered ERR 99 in conjunction with ERR 1 a few years ago when changing lenses  on my 1DmkIIn from a 500/4 to a 100-400. It resulted in a complete re-build of the camera circuitry which Canon paid for.</blockquote>