I'm going to Alaska this summer for a missions trip, but afterwards I will be staying in and near Anchorage for a week. I plan on renting a lens from lensrentals.com for the purpose of wildlife and nature. I have a wide angle lens, so I want something on the telephoto side that is light weight so I can hike with it. So far its between the 70-300 IS f/4-5.6, 70-200 IS f/4, and the 300 IS f/4. The sky will most likely be overcast and I only have 77mm filters. But I might be too limited with the 300. Suggestions on these lenses or other lenses are welcome.