My 20D Canon showed the error 99 today it seems to be pointing toward the EFS 17-85mm lens and the focusing mechanism. I just started messing with it , and now I am able to get it to work, without the error 99 when I have the lens zoomed out further than 25 mm, but that is all I know now. See if you have the same problem with a different lens. Hope that narrows what your problem may be.
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My 20D Canon showed the error 99 today and it seems to be pointing toward the EFS 17-85mm lens and the focusing mechanism. I just started messing with it , and now I am able to get it to work without the error 99 when I have the lens zoomed out further than 25 mm, but that is all I know now. See if you have the same problem with a different lens. Hope that narrows what your problem may be.
My 20D Canon showed the error 99 today it seems to be pointing toward the EFS 17-85mm lens and the focusing mechanism. I just started messing with it , and now I am able to get it to work, without the error 99 when I have the lens zoomed out further than 25 mm, but that is all I know now. See if you have the same problem with a different lens. Hope that narrows what your problem may be.