I have an old EOS 400D and the lens is not communicating wit the camera, do you have any suggestions

[ebiggs1]

First you have to find out whether it is the lens or the camera.  You can clean the gold contacts on the lens and camera but this is a long shot.  Use denatured alcohol and a q-tip, carefully.  You can reset the camera to defaults. Remove both batteries for a long while.

You need a friend with another camera and lens.  Determine which is at fault.

[anayapadial]

Hello, thank you, I did that and did not work, I also used another lens and it worked fine. But you say I should remove the two batteries for a while. I know of the battery at the bottom, where is the second one?

[RobertTheFat · Accepted solution]

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@anayapadial wrote:

Hello, thank you, I did that and did not work, I also used another lens and it worked fine. But you say I should remove the two batteries for a while. I know of the battery at the bottom, where is the second one?

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Why bother to look for it now? It sounds as though you've already proved that the fault lies with the lens.