50 1.4g Nikkor and still wanting more

[SquarePeg]

Consider the Sigma 17-70 2.8. It's a great walking around lens and will give you more reach than the 17-50 for $100 more. And it can function as a pseudo macro lens because the you can super tight to your subject and still get accurate focus.

Just a quick question on that lens. How long does it stay at f/2.8 before it goes to a max of 4 when zooming in?


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Unlike the 17-50, which I understand is a constant 2.8, the 17-70 is a 2.8-4 so only a 2.8 at the shorter focal length.