Hey all, Im pretty new here. I've been shooting with my D5100 as a starter camera for the past year and been recently thinking upgrading to a full frame until recently got word of an upcoming deployment to A-stan. Instead I have been thinking about holding off on the full frame and maybe picking up a lens or two instead.... Now are FX lens' compatible with DX APSC bodies? Also any suggestions for a good lens for either portraits/low light photography or landscape photography that will endure a pretty rough travel (Im thinking not the most expensive, I would hate to have a lens break over there)... Thanks!!