I'm seriously considering thru-hiking the Appalachian Trial beginning early next month. I would definitely take my Nikon F100. I only want to carry one lens (a zoom). I have a Nikkor 28-70 3.5-4.5 D that I've had for years and is a great lens. I'm thinking that I may want more on the telephoto end though, something more like 105mm. As for the wide end, 28 is fine. I'm not going to want f2.8 lenses because of their weight and bulk. Anyone have any suggestions on an all around great Nikkor zoom that would be a better choice than my 28-70? I know Nikon makes a 24-120. Anyone have experience?