Questions

How do I update my Sigma lens firmware?

Connect the lens to a computer via the SIGMA USB DOCK UD-11 (sold separately), then open SIGMA Optimization Pro*. If the lens firmware isn’t the latest version, the following message will appear: ‘The latest lens firmware is available’. Click ‘Yes’ to update. Thereof, Why is my lens not autofocusing? Autofocus will not be possible if

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