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I don't know if the OP necessarily need a fast lens. Hence in my previous posts I said that IF he shoots moving subjects in low light conditions then he should get a faster lens and/or flash. If he's just shooting night scenes, a faster lens isn't necessary because landscapes typically use smaller aperture so a 2.8, 1.8, even 4.0 would be pointless.
With that said, I think the perfect walk around lens would be 17-40mm, 17-55mm (pretty damn expensive), or 24-70/24-105mm if you have a full frame.
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