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I'm also considering trying a 2x TC on my 70-200mm F2.8 VR lens, as this would give me 400mm F5.6, but with VR as well (although I have heard reports that this combination can be prone to focus hunting...).
Which would you expect to perform better? Obviously the Bigma will have an extra 100mm, but the 70-200/TC would have VR, which could be VERY useful at these focal lengths!
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