Canon firmware upgrade affected Sigma lens

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nonproshooterdad Regular Member • Posts: 232
Canon firmware upgrade affected Sigma lens

I recently upgraded my 5D iii firmware to the latest, and when I used my Sigma 35 art for several shots, then experienced a communication error. The contact cleaning cannot make it work. I tried to upgrade the lens firmware via the USB dock, and it works again.

So it's the 5D3 firmware that made it similar to the 5D4 communication protocol that I have to upgrade the lens firmware to make it work. It looks like this is the scenario.

 nonproshooterdad's gear list:nonproshooterdad's gear list
Sony RX100 III Canon EOS 5D Mark III Canon EOS 6D Canon EF 50mm f/1.4 USM Canon EF 85mm f/1.2L II USM +12 more
Canon EOS 5D Mark III
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