I had a 430 ex ii that I was able to burn and replace with a Chinese version. It worked well but was never consistent. I finally have some extra money for this beast and I'm impressed. I've used it on both my 7D and 6D with 24-105L and also experimented with my 70-200 f2.8. I am so happy with my purchase. Can't wait to try this out on my local traffic light circuit.
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