David Kilpatrick wrote:
The best out there is the Sigma 7-16mm. I have owned the 11-18mm (three versions!) and actually rate it as pretty good, the geometry is superior to most other lenses. And the 10-24mm, and both Sigma 10-20mm (we still have one of the earlier models). The Sigma 8-16mm beats them all by a very large margin. We have the Olympus 7-14mm and that is pretty good
I used the 8-16 on my Nikon D7000 and would still be using it if my D7000 didn't need a windscreen wiper on it's Sensor but thats another story, an absolutely Stellar Lens but you must use it wisely and also try not to get your feet in shot!