just thought I wd share this link I have just found, this link particular to the 10-20 Sigma, but amazing site to view images from other lenses etc..
ignore if you know of it already:
http://www.photosig.com/go/photos/browse?sort=id-d&page=1&id=36444

thanks Dan that illustrates what I wanted to know, in fact that horizon is no worse than the 18-55 at 18mm, very acceptable - brother's head demonstrates well not to go too close tho' (ps-wd have been a nice entry for 'motion'!)
thanks again everyone for yr help....Lilly

Was that at 10mm?

I too am wondering if the 10-20 Sigma is going to be ideal for my needs.

Can anyone tell me (by example if possible) what the distortion effects are if photographing say people up close in a street scene, do you get massive distortion of main subject and out to sides?

I ask because I am aware the the 18-55 gives me bendy horizons as it is at 18mm, so will the Sigma 10-20 be a lot worse? Or is it a better lens

Cheers Lilly

First one yes is fabulous, love the subtle green bokeh, suits it well.
I am trying to decide between a 10-20 WA and a Macro, back to macro again - wish I cd have both!

That's OK then AJ

PS for DIRK:

Slap Generic term for make-up.

"I'll look beautiful once I've put on a bit of slap."
"I seriously doubt it, Brian."

I have just checked into this thread and just wish to set the record straight for my own satisfaction that my sky was as it came on the day.

Not that I think above comments was directed at me personally, but must admit I had to scan through them all to see which one he was referring to!

I actually have never got around to PSing a sky from another time and another place into an image of mine.
I like to try and keep my images as au naturalle as possible.

Anyway, here is mine without the slap on, warts and all!

Wow the Switzerland, Aletsch Glacier 3 (Greenpeace) image is amazing, I wonder how long they had to lie there