I have the 55-200 for many years. I wanted to have a larger area. I tried it in a zoo and am to peace fully with any image. The range 55-300 is ideal for zoos. The 55- 200 I also use. It is a little easier and I take it with hiking. I am glad that I now have both lenses. The experience I had with the 55 - 200 have made, I may as with the 55 - use 300.