I'm going on a safari soon and need a good telephoto lens for my Nikon D3100. I was going to go with the basic 55-200mm, but the maximum aperture is only 4, and on the 55-300mm it's 4.5. The animals are out early in the morning and late at night, so the light won't be great. I've heard that for low-light wildlife photography you need at least an aperture of 2.8, but the 70-200mm f/2.8 VS and VSII are both really expensive. Do I really need the f/2.8? Also, will 200mm of zoom be enough? Thank you!
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