Mark Sturtevant wrote:
Does the 'clean your contacts' solution ever work? I have never heard of it working. Worn contacts won't be solved by this, i don't think.
Two considerations.
1. Is the '01' message from one or some of your lenses, or is it from all of your lenses? If its from all of them, then the problem is the Canon body.
2. Are the effected lenses Canon lenses or Canon <i>compatible</i> lenses? Non-Canon lenses eventually are no longer supported on newer Canon bodies.
I’ve experienced this same problem with 2 lenses- 1 an actual Canon L tele, the other a Tokina ATX zoom. The problem was with the aperture unit in both. Both refused (Error 01) operation when set at f/5.6 or greater. If set to f/5 or wider then the lens operated fine in all modes.