hi gus, sorry i didnt mention that i need a canon mount.
reason i want a fast wide is for low light usage whilst away on my RTW trip next year, for shots out and about at night, sunsets, skys, people in bars and clubs etc etc. so i dont have to use the camrea shot, also so i can attempt hand-held shots.
i now, after reading about on lots of forums realise that a 2.8 is much more achievable, even if its not quite as fast.
ive been looking at the tamron 17-50mm 2.8 as i hear very good things about it.
diddy dave, that would be perfect, where can i find such a thing.