looking at Tamrom 18-400mm and Sigma 100-400. Or if I can find a good deal on refurbished Canon 100-400 that would be my choice. I don’t really see any other choices. With the Tamron vs Sigma....anybody use these and have a preference? Most of the time this will be for deer, eagles, Fox- whatever I find. I will also be in YNP this summer, and although would love a 600, it is too much $ for the 2 weeks of use. And I think too heavy. I have neck arthritis and just carrying the camera around bothers it. I also plan to get the 18-135 Canon. Is the 18-400 Tamron too much zoom? Not sure how I want to explain that question. I just wonder why they choose 18-400 and not 100-400 like the others? I currently use a T2i, but once I save enough get a 80D. I figured I would get the lenses for now so I can start enjoying them. Thanks! And Happy Thanksgiving. Although out my window it looks like Christmas!