Sigma 120-400 mm OS HSM Lens F4,5-5,6 DG (77 mm filter thread) for Canon lens mount (Electronics)
Are there better Telephoto Lenses with a long focal length, than the Sigma 120-400? Undoubtedly there is! One need not search long time to find one. The 120-300 from the same home is brighter, and should, if we are to believe the tests on the interne