Shawn Olson Guestbook
Magnus Fa said: [ Regarding Canon 10D Err 99 ]
I recently bought a Canon EOS 400D(3 days ago) and I have already got the err 99 message. It came only when I used an old Sigma zoom lens and took photos outdoor in daylight. I searched on the net and tried the pencil eraser method, but it didn't work.
After trying for some time, I found out that the message didn't come if i used an aperture level lower than f5.6. I then checked my lens and also found out that the lens was only made for aperture levels between f4 and f5.6. I switched to the manual modes and set the aperture level lower than f5.6 and it all worked fine.
I think it may be a communication problem between the old lens and the brand new camera that caused this problem. Maybe the camera didn't know that the lens couldn't get higher than f5.6.[ See Responses ]
op said: [ See Comment Stimulus ]
i think the err 99 could be a error with aperture control. My ef 75-300 4-5.6 III broke down with a noise when zooming and after that i could only take pictures with 300mm (f5.6). Every time i tried with smaller zoom&aperture, err99 appeared. I disassembled the objective and found out that the electric connections into aperture control were broken loose. So everything except aperture control was working and the result was err 99 when shooting with "wrong" aperture.
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