Thanks. Good technical reviews.
I'm in the process or selecting a wide angle lens for my 20D. Does anyone have strong opinions about the Canon EF-S 10-22mm versus the Tamron 11-18mm, or Sigma 10-20mm equivalents? I've found some '05 posts on the topic. I've read several review but can't find a comparision of the Canon lens vs the others. While price is a consideration it's not the primary one. I am will to spend the money to buy any of the 4.
I have 20D imager dust issues so at some time will upgrade to whatever the 30D replacement is...providing it has better anti-dust capability.