[mst]

what would you choose between an new Sigma 17-70mm f/2.8-4 DC HSM Macro OS  and an used Nikon AF-S 16-85mm f/3.5-5.6G ED VR . Mostly for landscapes and travelling, the price is the same.

I have used the 16-85 VR over many years, but personally I would prefer the Sigma nowadays if I had to make the choice.

However, you can't really go wrong with any of the two lenses for your intended purpose. The Nikon offers a wider focal range, while the Sigma's close-focus abilities can be handy at times.

If you got for the Sigma, make sure to get the latest edition of the Sigma lens (the "Contemporary" one).

-- Markus