Weather-sealed full-frame DSLR 
The Canon EOS 5D Mark II and other rugged full-framers are the choice of many travel pros; the format takes advantage of the entire field of wide-angle lenses.
High-speed Zoom Lenses
A three-zoom kit of a 14–24mm or 16–35mm, 24–70mm or 28–70mm, and 70–200mm such as the Canon L-series (shown) covers everything from ultrawide to long tele.
Fast prime lenses
F/1.8, f/1.4, and even f/1.2 prime lenses are valued for low-light shooting and limiting depth-of-field. The 85mm f/1.8D AF Nikkor here makes an ideal not-too-heavy candid/portrait lens.
Circular polarizer
A must for deepening blue skies, making flowers pop, reducing glare on rocks in streams and waterfalls, and cutting window reflections. There are several reliable brands—we show a Hoya here.