Why should you get another lens if you already have one? Well, there are a few reasons. One, What if you don’t like the macro lens that your camera was included with, because you want to get a picture of a bird, but that bird will fly away before you even get close! Telephoto lenses can zoom up tho a subject that is far away, but still has a good focus. And two, it is a good reason to expand your abilities by trying new things.