Err 01 message

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adams Regular Member • Posts: 135
Err 01 message

I have the canon 5d mark iv and a canon 24-70 2.8 lens.  Err 01 pops up constantly.  I have cleaned the contacts on both the camera and lens many times to no avail.  The lens gives the same error message on my Canon 5D mark II.  Other lenses work well on both bodies.  It is just the 24-70lens that is the problem.  Any suggestions to solve this issue? I have had the lens for approximately 6 years and taken maybe 1/2 million photos with it.

Mike A.

Canon EOS 5D Mark II
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