Sweet them canon ones are a nice peice canons fishy is 15mm iirc but they are awesome... Over 600 quid tho I reckon... Sigma do an 8mm which is what I'd go for as you'll have a crop body ? (well unless you buy a 1ds) but if I were you.,, second hand 30/40/1D mkI/ii and save for L glass. That's what you wanna spend ya money on.,, 17-40L ftw! But if you wanna 10-22 the sigma ones are good if you get a sharp one... I've seen one where only half of the lens was sharp lol!