When it comes to lenses to carry on a trip, it's good to have a range so you can cover a variety of situations. And with today's technology, zoom lenses often come close to or match the quality of prime, fixed focal length lenses.
If you are shooting digitally, you want to keep in mind the camera sensor factor before choosing a lens. A 17-35mm lens for a full frame chip becomes a 27-56mm lens when used with a smaller chip with a 1.6X factor. That's a significant difference in coverage, and if you love to shoot wide angle, it's something to consider.
The same effect is a consideration when choosing which telephoto lens to take. A 70-200mm zoom becomes a 112-320mm lens when used with a chip with a 1.6X factor.
I always try to pack as light as possible, but insure that I have a bit more focal length range than I think I will need if I can fit the extra lens in my bag and am willing to carry the extra weight. I might think I am only going to be shooting broad landscape images that show scale and intimacy, but along the way, I might be surprised by a scene where a telephoto lens makes a more succinct statement, as the image at the top exemplifies.
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