Ok. I'm a newbie and I just bought a used Canon EOS Rebel T2i to mostly take on vacations and other little outings. It came with a 18-55mm. After doing some searching on Reddit, I saw the 50mm f/1.8 recommended, so I ordered that too. My cousin is selling 55-250 lens for $70, and a 65-250 for $80. Now, I have no clue what I'm doing, and don't know if I should buy one of those from him? Keep the 50mm? Return it? I'll be mostly taking pics of scenery, buildings, things like animals in zoos, etc...