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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.

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  • \$\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\$
    – Ralf Kleberhoff
    Mar 6 at 10:49

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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
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