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I use the Sigma 70-200 f2.8 (not the current one but its predecessor in 2004) with a 1.4x TC and the results are excellent. Since the Sigma is f2.8 throughout the one stop penalty of the TC doesn't really matter. I've also used the lens with a Kenko 2x TC but the results aren't so good.
I have just acquired the same generation of that lens - so which 1.4X TC have you used with it? (I have the basic Kenco 1.4x, not their high quality one or the Sigma one)
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