My 2cents. I have the Tamron 100-400. I assume my comments can be transferred to your lens. I find it heavy and hard to keep steady-especially in wind. I also find it does not focus well if everything is gray. Those dull, gray lifeless days. I do find it works well on sunny days or when there is good contrast for the auto-focus to pick up on. Overall, I have made progress on it overall. Have learned how to hold it steady plus got a tripod/monopod . However, for landscapes I go to lighter lenses-18-135 or 55-250. I use my 400 for wildlife almost exclusively. I almost exclusively use spot center focusing. If it’s a gray lifeless day I rarely even try my 400. The long lens needs more light than our NY days sometimes provides! Lol. Like this weekend!