It would really help if you provided some more info with your question. I'll have to deduce some assumptions based on your question, so please correct me if I'm wrong here:  - Your budget is limited (lenses over $1000 disregarded)  - You're not planning to go fullframe in the foreseeable future (lens with fullframe coverage is not required)  - By nature/wildlife you mean distant subjects (only lenses with 200mm focal length or longer considered)  - You want quick autofocus an