Answer to: I keep getting an error 99I have the same issue, error 99 and have to power cycle off and on to do anything. Only a problem with one of my lenses though, so not as bad as yours. Said lens got barged into by another tourist while on holiday and I get the error only on f5.6 apeture. I'm going to teardown the lens one day to inspect. Will post findings if I have anything to report.