Beginner here. I have the Canon Rebel XS, with the lens that came with it (EF-S 18 - 55mm f/3.5 - 5.6IS), and a Canon EF 75 - 300mm f/4.6 - 5.6 telephoto lens. I am going to Hawaii, and would love to get some sort of wide angle lens for the trip. I really don't know too much about lenses, and would appreciate any thoughts (and also whether or not I should stick with Canon lenses, or if there is a cheaper alternative that doesn't sacrifice quality). Thanks!