Sorry Frank
Did not mean to confuse you –I was answering Duncans last post.
Duncan is correct in what he says – my confusion arose because all my lenses are f2,8 or f4 all the way through so even with a 2TC the worst would be f8. As he quite rightly says, at your 500mm end you have f6.3 less 2 stops for your TC.
I have been to a few Sigma 50-500 review sites and it looks as though with the Sigma TC2 you have to go completely Manual.
Brian
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