I have a D7000. When I travel I carry one lens, an Nikon 18-300 VR. When traveling I don't want to carry a bunch of lens. It doesn't matter where I travel. Limited space and weight. In your case the Nikon 70-300 VR and the Sigma 17-70 C would do you fine.
So for a 6 week vacation, which of two these three would you carry: 17-70, 18-200 or 79-300
I would take the 18-200mm and not have to worry about changing lenses. It is a great lens, very versatile, covers a wide range, and is pretty easy to travel with. Have fun and enjoy your trip.
So for a 6 week vacation, which of two these three would you carry: 17-70, 18-200 or 79-300
All of them. Each of the three have different ranges for reasons. The new lens duplicates coverage but still offers it's own range. Six weeks of down under might make you regret leaving any of them behind. This amounts to "one more lens in the bag" and shouldn't be too much extra weight. One of the worst vacation feelings is "Why didn't I bring . . . " and you fill in the blank with a lens, or a child. Take 'em all!
And, just given to me: Nikon 18-200 VR So for a 6 week vacation, which of two these three would you carry: 17-70, 18-200 or 79-300
Does the 6 weeks include the weekends at both the beginning and the end ? I'm on a 5 week vacation, but mine runs from midweek to midweek so I brought only a kit zoom and that has proven to be really my best decision. Here's some result: