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Just make sure your programmer supports it. They switched to a new protocol since they don't have enough pins.
Though to be fair my version doesn't meet fast mode timing either, at least not for the first bit (wakeup latency). That *could* be improved but it doesn't matter. I don't think any of those Sigmas supported fast mode.
Do the bodies fall back to slow if fast fails, or does the lens just not work then? I haven't scoped my T5i to see what speed it runs at.
They only switch to fast mode if the lens IDs itself as something that can support it.
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