The Sigma is a cracking lens for the money. You can pick up a non DG version second hand for around £1000. Believe me, it isnt worth paying extra for the DG version. The AF is as fast as a 500mm nikkor (near enough for you not too notice!) & is quite a bit lighter than 400 f2.8. You can hand hold this lens as i have in the past, but its much better on a tripod. If money is no object, then go for the Nikon, if it is, then the Sigma is a bloody good buy for the money.
Regards Rob.
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