I get error 01 displayed, I can't take a picture at all. But if I connect the camera to the app and change to manual with AF, I can take pictures. What could be wrong? A defect in the lens?

I'll also add that when it's cold the temperature is in the minus, the camera completely stutters.

  • \$\begingroup\$ Which lens? Did it work previously? I'm asking because there are compatibility issues with some Canon bodies and third-party lenses. E.g. I have a Sigma 400mm that works in full-open mode and gives Error 01 when stopped down. \$\endgroup\$ Commented Mar 6, 2023 at 10:49

1 Answer 1


As per Canon site Err 01 mean

The communication between the camera and lens is faulty.

What is recommended:

Very gently clean the electrical contacts (highlighted in red) on the camera and the lens using a clean and dry cloth

When cleaning the contacts take the following precautions –

  • Do not wipe the contacts with a wet cloth
  • Do not touch the contacts directly with your hands. Touching them with your hands could cause corrosion, which would cause the camera to become inoperable
  • When cleaning the contacts on the lens side, be careful not to damage the lens surface

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.