Here's a review of the Sigma 10-20. It has a kind of strange barreling effect at 10mm, but only at the far edges of the image.

But maybe lexi is actually talking about the natural distortion of such a lens, not the barrel. That's normal for a ultra-wide lens. For example, look at this picture in I took in Macau at 10mm with my Canon XTi/10-22:

rkkwan.zenfolio.com/p321623579/?photo=601906813

Look how trapezoidal the Cathedral look? Or that white minivan on the left? That's the nature of a lens like this when you shoot an object at an angle. The effect is even more pronounced if you're pointing the camera up or down. Like this one, also in Macau. It can create very interesting picture, and I love it!

rkkwan.zenfolio.com/p321623579/?photo=700068692

Sorry, forgot the link to the Sigma 10-20 review:

http://www.photozone.de/8Reviews/len..._456/index.htm

Thanks rkkwan for sharing your photos and posting the Sigma review. Hopefully this weekend I can really give the new lens a good testing and figure out the best settings for the big landscape shots.