I'm going to be in africa, specificaly uganda shooting wildlife, and will be spending a few days with the mountain gorillas. Its my first trip to africa. I am looking for suggestions on lens, or other photographic equiptment to bring. There will be alot of hiking, and for the gorillas low light conditions with no strobes allowed. Space, and weight will be limited. I'd like to bring the minimum, for the maximum results. I'm shoting a nikon D2x.