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 ...


The flashing light stopped (and possibly the cause of draining of the battery) when I used a torch to look inside the CF card slot and noticed that one of the cf card contacts was bent and was touching the other contact. Bending it back fixed the issue!

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