Agree Andy, you were the one in this thread who opened my eyes again to the Canon. Glad you did. Thanks!

You're welcome! :-)

Also, here's another thread on DVinfo that has some good info about wide angles for the 7D, new 550D etc. - linking it just so anyone looking at all this stuff can easily and quickly get as many views as possible.

http://www.dvinfo.net/forum/canon-eo...ve-2-mind.html

I had the same question as you did, and after searching extensively I concluded that out that the Tokina is the best option, not only because of how wide can it go, still being a zoom, but especially because of it's speed (2.8 constant).

I have a couple of sigma lenses, which are of good quality, BUT BEWARE! if you happen to travel outside the country of purchase and it malfunctions, even when they say they have an international warranty, you might not be able to get it repaired unless you pay (this is just happening to me as we speak)

Canon as always is a sure bet, but as usual, you pay more for a similar lens.

If you use lens adapters (eg: 0.4x), you will stop the light down, and that might become a problem in certain situations.

The problem with the tokina's is to get hold of one. I finally managed to buy mine today after being in a 4 month waiting list at B&H, and apparently they just ran out of them again.

Mauricio