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Re: Advice please
The Canon lens is no brighter than the Sigma. It is theoretically 1/3 stop faster at its longest end, but I can't confirm since I don't know what the Sigma is at 400mm. The Canon will be f5.6, while the Sigma will be around that but no more that f6.3. I suspect the Sigma is f5.6 at 400mm as well, so no brighter. The Canon…
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