Canon is the market leader in terms of camera sales, and one of the most recognizable brands in the world today. Its lens family includes options for entry-level APS-C DSLRs as well as its full-frame professional bodies. In 1987, Canon introduced its EF autofocus lens mount, which means that its system doesn't support legacy lenses. Still, its roster of available glass is huge. Whether it's pro-grade telephoto lenses for sports and birding, or fast primes for low-light shooting, Canon has something for everybody.