For action photography no lens gets more work than the venerable 70-200mm f/2.8. With the addition of built-in focus motors over the last decade (called USM by Canon, AF-S by Nikon and HSM by Sigma) as well as support for Teleconverters for extra reach it is a great "go-to" lens for action indoors and out. Show up with one at your kid's soccer game or swim meet and you're guaranteed to get jealous looks and more than a couple questions. And of course you'll get plenty of images that others with their slower kit lenses will miss out on….
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