My EOS 400D and err99 with canon 24-105 1:4 L IS USM

guscordoba66

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8 Apr 2010 - 4:25 AM

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Hello everyone!!!
Need help... maybe a silly issue but I can't get it through by my self... I bought a second hand Canon lens 24-105 macro 1:4 L IS USM and in spite my Rebel XTi is off the lens makes a USM sound that goes off until I turn it on and press the shutter half way but when I try to take the pic it goes err99 and displays error information... some people told me to clean contacts though nothing different happens... should I throw it away? Any suggestion or piece of advice? thank you anyway!!!

strawman

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8 Apr 2010 - 9:26 AM

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Lens failure is a common cause of ERR99, set the camera to aperture priority and set the aperture on the camera body to as wide as it goes. If the camera now takes a picture with no error codes then the issue is the aperture on the lens is not reacting correctly. Probably why it was sold.

davey_griffo (e2 Member)

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8 Apr 2010 - 10:19 AM

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I was told by my brother, who works in IT, that the best way to clean equipment contacts of any sort (he demonstarted on a SIM card for his cellphone) is with a pencil eraser. Obviously if you do this, you'll have to be VERY careful about getting any shavings inside the camera, if only to stop sensor spots.

guscordoba66

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9 Apr 2010 - 4:02 AM

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Thank you all very much!!! I tried the pencil eraser thing and the lens started to work well; though, when I change it and put it back again the problem continues as long as I turn my eos on, then it works as expected!!! Think I got it for a cleaning and general revision. But thank you again for caring and your fast answer!!! I got the battery issue in mind too...