wygrzebane w necie:

"5 error is a mirror return error.

The reason or this error message is that the mirror not is returning after a shot. To normalize the camera, a second press on the trigger button is necessary. 4. Note that all functions operate perfect, and the mirror slides smooth in its trace.

The 5 error often happens when using 3rd party lenses (Sigma, Tamron, etc.) which cause incompatibility problems. Were you using a non-Canon lens?

Also clean all contacts with a pencil eraser. Do this with your battery contacts as well and try fresh batteries."