D7K and 70-200 - Nikon vs. Sigma

Started Jan 24, 2012 | Discussions thread
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Soverain
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D7K and 70-200 - Nikon vs. Sigma
Jan 24, 2012

First of all: sorry for asking what many of you have probably been asked many time before. Second: Thank you very much if you choose to answer anyway!

I'm going to buy a 70-200 f2.8 for my D7K, and I have almost decided to get the Nikon VrII, but the Sigma is half the price with a campaign going on right now.

My main question (that I haven't found answered), is: is there a big difference in how fast the lenses focus? As I intend to use this for sports (hockey), I really need fast focus.

Build quality seems to be much better with the Nikon from what I read, which is to be expected, considering the price.

Image quality also Nikon, but is it a big difference for everyday use - and particularly for the kind of use I want it for (high-ISO sports action)?

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