EF 70-200mm f/2.8L IS III USM on a R5, R6 and a 5DM3 lost the ability to focus.

[Walt1]

I was getting a err1 code on my R5 when I was using my EF 70-200mm f/2.8L IS III USM lens and cleaned the contacts with an eraser and a cloth now the lens will not focus, I borrowed a version 2 of same lens but that will not focus on any of the cameras as well. But if I put my version 1 lens on any of the cameras it works just fine.  I am using a canon EF-EOS adaptor new and old and same results with both.  Is there anything I can do before I ship everything to Canon service and take out a home loan to pay for it all? lol

[deebatman316]

Does the camera report the aperture that is set or does it say F/-- or F/00 for the 70-200mm F/2.8 IS MK II and MK III versions. When you say the version 1 lens do you mean the original non-IS version or the 1st gen IS model. What happens if you try the affected lenses on an EF Mount camera. Do they work correctly on that camera or does it report F/-- or F/00.

[NatalyaP]

Greetings Walt1,

Per your description, it is odd that the same focus issue occurs when testing a couple of different EF-EOS adapters with the two lenses, the version II and the version III. It appears that the first generation of the lens seems to work without issues on the camera bodies. An Error 01 relates to a communication issue between the lens and camera body and would include the adapter if the lens is an EF lens on a mirrorless camera. You have cleaned the contacts, and the issue seems to persist, and you have confirmed that the auto focus is not working. The next step is to suggest on sending the lens to our facility for repair.

Canon U.S.A., Inc. has created a new online repair portal that allows you to set up service in a few simple steps. The repair portal gives you the ability to set up service for multiple pieces of equipment at once, and to receive a repair estimate in the majority of cases, depending on your model and issue. The portal also allows you to upload images or videos that will assist us in repairing your product. You can also select how you wish to be notified of the progress of your repair. The portal's service history section allows you to view all services that have been performed on any of your camera or video products since January 7, 2020.

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