Yes there is this lens and a newer one with the same specs from Sigma. Actually Sigma makes two versions, a lighter and less expensive Contemporary and a heavier and more expensive Art. If you shoot Canon, they came out with a new version 2 of their popular 100-400 lens, but of course 400mm is much shorter than the Tamron and Sigma at 600mm, but the Canon is reported to be amazingly sharp. Still I have seen excellent reviews and photos from both the Tamron and Sigma and I think either one would can produce professional quality results in the right hands.