Canon 5D + TTL extension cable doesn't work

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Drahila New Member • Posts: 8
Canon 5D + TTL extension cable doesn't work

My setup: Canon 5D (classic) and Sigma EF-530 DG ST. I bought Godox TL-C extension cable which replaces Canon OC-E3.

It seems that when trying to use the extension cable the flash doesn't fire in TTL mode nor in manual mode. Also the flash zoom head doesn't move to the right focal length but stays in 24mm. Also the focus assistance beam doesn't work. So it seems like there's nothing going throught the cable.

I tried my other flash which is full manual. It works and fires with the cable.

I checked the continuity of the pins of the cable with a multimeter and there's nothing wrong. Also cleaned my Sigma's contacts just in case with anti-tarnish. But it just doesn't work.

Any ideas?

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