My husband and I will be moving to the Blue Ridge Mountain area in Georgia this summer. I am in the process of buying the d7100, but confused on what the best low light lens will be best for me. My main focus is on landscape and wildlife. Most of my low light photos will be of sunsets and sunrises over the mountains. I also would like a low light lens that I could take to San Fran when we visit my family. It doesn't have to be one lens for both. Thanks ahead of time.