I'm headed for Torres del Paine and Los Glaciares in January, and I was hoping to get some advice. I had hoped to do the full circuit for Torres del Paine, but time constraints and physical conditioning (or lack thereof) may relegate me to doing the "W" route instead. I have heard that the "W" hits the most scenic parts. Am I missing much by not doing the full circuit? Any tips for Los Glaciares? I was basically going to follow the route recommended in Lonely Planet. Lastly, lens choices. I'm taking my 10D and my 17-40mm/f4. I'm thinking of taking my 28-135mm IS, but I could instead purchase a 70- 200/f4, which would give me quite a bit more reach. The 28-135 would give me 200mm at the long end on my 10D, so I'm thinking that should be enough for my main purposes. I expect to do mainly landscapes, but I imagine there will be opportunities with Guanacos and birds. However, I am given to understand that the Guanacos are very approachable, and a long lens probably isn't necessary. I've owned the 70-200/f4 previously, and know its capabilities. I'm more concerned about adding more weight to my pack. (I'm hitting 45 lbs. as it is - 25 lbs. of camping gear, 10 lbs. of food/water, and 10 lbs. of camera gear.) So, can anybody with experience comment on the utility of the 70-200 (effectively a 100-300mm lens on my 10D) versus my 28-135 (effectively a 44-216mm lens)at Torres del Paine and Los Glaciares (Fitzroy)? Any other tips or comments on the locations I'm visiting would also be welcome.