I have the Canon 10-22 I have had great results.
I looked at both of the others and decided on the Canon.
The shot below was taken with the Canon 10-22. This isn't stitched.

Go for the Tokina, the quality is awesome and easy to fit filter.
Sigma are not bad but filters is the problem.
I use the Tokina with the Nikon and I am very happy.
All the landscaping photography in my page are with the Tokina and many of the abstracts as well.
Cheers
I have the Canon 10-22 I have had great results.
I looked at both of the others and decided on the Canon.
The shot below was taken with the Canon 10-22. This isn't stitched.

I purchased the Canon 10 - 22 Today at a good price - so I gues I'll live with that decision .
I'm currently down the South Coast in NSW testing out my new gear .
I'll let you know what I think of the new package .
Cheer's .
I bought a tokina at what I thought was a good price
$570 and that is for the Mark11 one
However after the money went through they contacted me and said its out of stock and on back order...they said I could cancel order if I wished,
I'm not sure I want to cancel as it was a good price however I dont also want to be waiting months...
from the reviews I read the tokina was on par if not better than its Nikon, canon near equivalents thats why I thought I would give it a shot
Our Land Rover does not leak oil! it just marks its territory.......
Ok - - I've added a few things to the new Canon Kit
Canon 100 F2.8 ef usm Macro
Canon 10 - 22 efs is Wide angle zoom
Canon 28 - 135 efs is zoom
Canon 50 - F 1-8 Standard lense
Canon 17 - 85 efs is zoom
Canon 430 EX 11 Flash unit
Canon BG-E5 Battery grip
Canon 450D Body with standard kit lense and hand grip
Canon lense hoods for all lenses
Hoya filters for all lenses
Getting there slowly
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