az-dave Offline Upload & Sell: Off
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I will be buying either the Tamron or on of the 2 Sigma's. I'm not in a hurry so can wait for the reviews to come in. It's always nice to have choices.
I do wonder at what point the Sigma lenses become slower than 5.6. It will probably be at different focal lengths between the 2 lenses.
400 mm 5.6 + 1.4 TC = 560mm F8
500 mm or greater 5.6 + 1.4 TC = 700 mm F8
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