I own a Canon XSi camera. I am looking at getting a telephoto zoom lens. I want to take pictures of a mountain range about 30 to 50 miles away and have the picture look very close. I have been looking at the Canon 28-135mm ($600) and the Canon 55-250mm f/4-5.6 IS ($250). Which one will give me what I want? I do not have a lot of money to spend.