"This is actually a question I’ve thought long and hard about having gone on several overseas and interstate trips over the past few years. The answers that I’ve come up with have varied from trip to trip considerably and have depended upon a number of factors including the length of the trip, the nature of the trip, my current ‘favorite’ lens and my current phase of photography (I tend to go through phases where my style in photography changes a bit). A lens can make or break you in terms of image quality. I constantly advise people to get the best one that they can afford as an upgrade in lens will usually lead to much greater improvements in image quality than an upgrade in camera body. The main considerations that you’ll probably want to consider when buying a lens for travel include..."A solid article that covers off some of the things you'll want to keep in mind when selecting which lenses you'll take/buy for photography while traveling. It's Canon-centric, but the basic principals are the same regardless of which lens system you're locked into.