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Following David's generous info,' I tend to use a Sigma DC 17-70mm with my Nikon D80 and seldom consider changing it in the field.I have other lenses that, like David, I rarely cart around, and they tend to remain at home in my camera bag (which is another blithering nuisance), along with my tripod (used twice in twenty years), flash unit (three times) and camera case. Travel light is the mantra, just the camera, a spare battery and three memory cards for each day in the mountains (oh - and Sue, of course)!