what len were u using then? the only time I encounter this err is with the 70-200L 2.8 IS.. I cleaned the contact and it managed to work then it came back after a while. Do a search on the Net, most of it is incompatible with lenses300N said:Hi Canon User,
Do you encounter of using ur 300D dig cam with the 550EX Flash appear Err 99 after shooting a few shots? Is there any incompatible problem with this flash? Please advice.
i think you shld bring yr camera in and have canon guys check on it, I usually unscrew and screw the len back to get it working again. But that only happens when I use the 70-200L 2.8 IS300N said:I am using 18-55mm kit lens, 70-200mm F4L and 50mm F1.8. I have try many method such as removing battery and install again but fail. Do you have any more methods to resolve this problem? When I shoot with one shot, it will appear Err 99 but did not record any shot.
At first i tot it was my Sigma lens but I have been using it for very long time without problems.. its only when i used a 3rd party batt then the err99 came up.. guess its contacts are dirty coz its contact are quite dusty.. after i changed back to the orginal batt and those east gear batts then ok liao.. cam still under warranty but din send in to canon.. till now its working fine..300N said:Hi Jer76,
U mean a third party batt.. with get err99. Is your dig cam under warranty or not? Where do you bring it to service? What did he tell you?