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Better get the Sigma, the lens is designed for it The 1.4 TC will make it a 840mm lens, but also a F/9 lens. So: The AF will struggle, assuming it works at all, forget it for birds in flight (but then, aiming at birds in flight with a 840mm lens requires a lot of training)... Even with decent IS, you don't want to get too long exposures (especially on a ...

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